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 Post subject: TTT630PLK vs. Simpson 260-4 thru 7P VOM designs similarities
PostPosted: Nov Sat 19, 2011 12:34 am 
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Last edited by Fred Scoles on Nov Tue 22, 2011 6:23 am, edited 1 time in total.

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 Post subject: Re: TTT630PLK vs. Simpson 260-4 thru 7P VOM designs similari
PostPosted: Nov Sat 19, 2011 1:14 am 
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....as I was getting all pumped up for another fascinating VOM debate :P

Happy Thanksgiving to you too! :D

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 Post subject: Re: TTT630PLK vs. Simpson 260-4 thru 7P VOM designs similari
PostPosted: Nov Sat 19, 2011 2:02 am 
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MarkPalmer wrote:
....as I was getting all pumped up for another fascinating VOM debate :P

Don't want to disappoint you Mark :-)

I used to think the Triplett meters were ugly, and only liked the Simpson 260/270's. I had never seen a real Triplett in the flesh, just photos in old Allied and Lafayette catalogs. I guess I must have been thinking of the vanilla 630's, because a couple of months back I stumbled over a gorgeous Triplett 630-PL with 639-N carrying case at the MIT flea and I could not resist buying it. I love the luscious maroon knob and that huge meter. I dreamt about it for days afterward. No, seriously :-) I even felt bad about negotiating down the price on it :-) Now it's my favorite analog meter.

Best regards,
-Steve


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 Post subject: Re: TTT630PLK vs. Simpson 260-4 thru 7P VOM designs similari
PostPosted: Nov Sat 19, 2011 2:12 am 
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I had a Triplett 64 FET-VOM that was a very respectable, well made meter. I ended up selling it as I wasn't using it, but now that I have quite a collection of multimeters including several Simpson 260's, I regret selling that Triplett as the 64 isn't all to common to come across today. I think the 30 volt battery thing, even though easy deal with, has shied me away from the older TTT's.

-Mark-

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 Post subject: Re: TTT630PLK vs. Simpson 260-4 thru 7P VOM designs similari
PostPosted: Nov Sun 20, 2011 5:13 am 
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The Knight-Kit 20Kohm/v VOM has many of the design similarities of the Triplett 630 -- Allied even got the meter movement (I suspect with the scale also) from Triplett. Because of one design flaw in the K-K/Triplett, I can comment on one difference that's significant: notice that the Triplett has a switch setting for the 10A current range while the Simpson has you move the banana plugs to special 10A jacks. The 10A shunt is directly across those 10A jacks while the contact within the function/range switch of the Triplett is part of the 10A circuit. If you accidentally overload the meter on the 10A range, you can blow the contact on the switch to smithereens. I did that with the K-K and have to live without that 10A range -- no big deal, really. Just irritating.

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 Post subject: Re: TTT630PLK vs. Simpson 260-4 thru 7P VOM designs similari
PostPosted: Nov Sun 20, 2011 5:57 am 
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Last edited by Fred Scoles on Nov Tue 22, 2011 6:22 am, edited 1 time in total.

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 Post subject: Re: TTT630PLK vs. Simpson 260-4 thru 7P VOM designs similari
PostPosted: Nov Mon 21, 2011 12:46 am 
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So I've been trying to research the different classic Triplett 630-series VOMs, but I'm confused over the line-up. What are the various models, and what's the difference between them?

I see Triplett (now Jewell) is still selling the plain "630". They say it has "25 ranges". My 1965 Lafayette catalog also lists a 630A, which is a higher-precision version of the plain 630.

The 630-PL (and 630-PLK, the version of the 630-PL with a protection circuit, and the high-accuracy 630-APL), with 28 ranges comes in a case that's more attractive to my eye, but otherwise seems similar to the 630. Why two similar models (630 and 630-PL)? My 1965 Allied catalog evens lists them at the same price. Is the 630 in a bakelite case, with the 630-PL in an injection-molded thermoplastic case?

The 630-NA looks to be the same case style as the PL, but with 58 ranges, including a "range doubler" switch.

The 630-NS looks similar to a 630-NS but with 200K ohms per volt sensitivity instead of 20K ohms per volt.

The 631 is an odd VTVM/VOM combination, in the 630-PL case style.

Were there any others?

Best regards,
-Steve

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 Post subject: Re: TTT630PLK vs. Simpson 260-4 thru 7P VOM designs similari
PostPosted: Nov Mon 21, 2011 2:34 am 
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 Post subject: Re: TTT630PLK vs. Simpson 260-4 thru 7P VOM designs similari
PostPosted: Nov Wed 23, 2011 6:44 pm 
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I had deleted a day ago my original answer to Steve's question above (what's the TTT VOM lineup???Steve asked us, which is a perfectly excellent question) simply because I got far too verbose and off track, so I had to delete it....soooorrrryyy bout that everyone......so I'm trying this again, and hopefully accurate.

The first Triplett Model 630, with the "curved-top" black, plain Bakelite case, was first introduced around Fall 1947 (Alan's book is more correct than I if he listed a more specific date..), specifically to replace model 625-N, which was good, of course, but very dated and it didn't keep up with Simpson's newly introduced series 260-1 VOM. This first TTT630 is what collectors call the "Red-Dot" as its movement came with a "lifetime" guarantee and its insides have a unique bakelite resistor turret with the resistors in vertical wells, not like the 630's made after Sept. 1952 when the changeover was made (all Triplett bakelite cases were molded in Bluffton at an old Paige Dairy, converted plant, because the smell made some folks sick). Triplett took pride doing everything themselves; the magnet wire was contracted from specialty companies like Belden, and the clear lucite (for panel meter PL & 630 lenses) arrived from Dupont plastics. These earliest 630's were and are great performers and in every Triplett collection, but relatively few were made, because they continued the 625-N until about Fall 1955 according to catalogs. Most Ebay sellers know little about Triplett, so one could ask them to send a couple pictures to know what you're bidding on.

Chronologically the next VOM.. Model 630, also in the curved-top black bakelite case; it's first recorded production run was Sept. 1952, with every feature that was retained thru plant closing in '07, except they stopped hand wrapping and beeswaxing their precision resistors (when I arrived at plant in '07 there were still old bins filled with beeswax coated resistors), and contracted out to Dale/Vishay & others for precision one percent films after that. We made 3 trips to Bluffton 3 summers ago to load up the remaining Triplett stuff and then back to Oswego NY). That VOM also displayed the new 600OHM/1mw newly registered dB scale, not the older 500 Ohm scale found on the older Reddot 630's. Next, about late 1953, the first model 630-A was produced, which is a more precise, mirrored-scale 630 (1 percent mvt and resistors, instead of the normal 1.5 % resistors and 2.5% mvt..the movements are physically identical, but the "A" received the production line #1 magged movements which assured best linearity and other parameters). Later and thru to '07 there were, various special varieties and production runs of other 630's such as Model 630-D for Bell Labs, and some of them have the Bell logos which are collectible. By the way, the (older, from 1933 to ~ mid '60's) curved top Triplett logo, was designed by Norman Triplett, son of Cleon who was a brother of Ray (company founder). My Mom had related that story to us because she had worked in early '30's in shipping dept with Cleon's wife Blanche. Then the company was still called only "Readrite".

The next was Morris Triplett's (signed "MMT" on his manuals/files, or "Morrey") 631 VTVM/VOM design about April 1953 w/ Oldaker of Dunkirk making its special probes to design, it used a recently introduced (by Sylvania) miniature/battery hexode 1R5/DK91 as a triode amplifier. Today, the model 631 is still useful and collectible. I had written for Triplett website in 2002, a DIY article describing how to retrofit currently available batteries to run it, but their new owner, Jewell, decided to drop that article and others. Next comes model 630-L. The "L" featured "low power Ohms" scales (not enough power to trigger forward biasing in either a Ge or Si chip) w/o any active components inside....quite a feat at the time...but to do that they had its Ohms scales running backwards. The 630's that came after this were introduced in such rapid fire that the existing files don't list when each model went in to Production Run Number 1, they are: 630-PL a standard 50ua mvt 20K opv & 5K opv on ACV ranges (which was the US standard meter-grade half wave bridge of that time), 630-NA ditto but was the very first of the series to have the little gray slide switch under the main knob, which simply kicked in the voltage divider network to proved double the number of ranges.....a good engineering feat. 630-PLK which is a PL but with the added overcurrent protection circuit which comprises their patented (none of Triplett's printed manuals told you what was inside this circuit, because it was Proprietary/Patented; switching transistor sensing ckt that could trigger a big-ole relay off if you tried zapping it with something the meter didn't like. These Protection ckts worked as long as you don't get them near a high-tension power line or near high field RF's which will "fool" the sensing ckt, as documented in a Triplett engineering folder from August 1970 by TTT engineering. The 630-APLK is a PLK with the more precise mvt & resistors and a scale mirror....but by about 1976 they combined (possibly to make more corporate profits and reduce distributor stocking demands) those two models into model 630-PL which has the good resistors and the mirror. Next came model 630-NS which is similar to model 630-NA visually and internally, but with the 5ua fs mvt for a sensitivity of 200,000 opv DCV, and 100,000 opv DCV with the (voltage divider) slider kicked in, these are popular on Ebay, but some of them have lost much of their movement's magnet field which prevents calibrating the tester. According to a previous company engineer I had spoken with, models NS & M have their magnets saturated enough that they can more easily lose field over time. Next in line in the TTT 630's is model 630-M, which went thru only 2 production runs, and a total of six of them were ever made (since this was written, ARF members have shown that many more M's were made, but were rarer than other models), and according to Mr. Ropp Triplett (pres when I was growing up), only two of them got out the door to a distributor (perhaps he was joking?...it was known that line workers disliked assembling and calibrating M's). The "M"'s mvt is 1ua fs for 1 million Ohms per volt DCV, and 500,000 opv with the slider kicked to the Right (it looks identical to a 630-na or ns on the outside); inside it's different though simply because at that high sensitivity they could not use the regular bakelite resistor holder turret because the bakelite attracted too much static and/or summer humidity, so it has a special thick fiberglas circuit board and white nylon sleeves around its panel jacks.

Equally popular were models 310's "Mighty Mites" miniature shirt pocket size VOM's: including models 310, 310C, 310F (later ones were 310FET), 310TEL, 310J (mail-order catalog Sherman Jensen/Stanley Tools), 310 IBM, 310Bell for telephony work, and many I'm not aware of, as files show many additional types of 310's that Triplett made for various service companies for special applications.

And last but not least, the 1970's thru the closing in '07 Model series "60's" analog VOM's, which were all developed to conform to the new ANSI/MSHA mines antispark/detonation safety protocols; they include but are not limited to: model 60, 60A, 60ES, 60D, 60DC, 60NA, 60AC, & 64FET (originally introduced as a VOM, but later a "VO" because it has no ma ranges). All of these are rated for up to a 6ft fall to a hard floor w/o damages....but don't count on it...!!!!! On a couple of my 60's testers, the case plastic has become brittle with age.

Fred


Last edited by Fred Scoles on Nov Mon 02, 2015 8:50 pm, edited 3 times in total.

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 Post subject: Re: TTT630PLK vs. Simpson 260-4 thru 7P VOM designs similari
PostPosted: Nov Wed 23, 2011 8:24 pm 
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MarkPalmer wrote:
I think the 30 volt battery thing, even though easy deal with, has shied me away from the older TTT's.

I bought an Eveready 413 30 volt battery for my 630-PL from Battery Mart: http://www.batterymart.com/p-eveready-4 ... ttery.html, along with an Eveready 412 22 1/2 volt battery for my URM-105C. A little pricey, but I figure it should last quite a few years before needing replacement.

Looking at Battery Mart's site again, I see that they now warn "Limited Quantities Available" on the Eveready 413 and 412. Maybe it's gone out of production? Perhaps the Chinese will revive it as they have others such as the No. 6 dry cell.

Best regards,
-Steve

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 Post subject: Re: TTT630PLK vs. Simpson 260-4 thru 7P VOM designs similari
PostPosted: Nov Wed 23, 2011 8:25 pm 
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Dean Huster wrote:
notice that the Triplett has a switch setting for the 10A current range while the Simpson has you move the banana plugs to special 10A jacks. The 10A shunt is directly across those 10A jacks while the contact within the function/range switch of the Triplett is part of the 10A circuit. If you accidentally overload the meter on the 10A range, you can blow the contact on the switch to smithereens.


Dean, thanks for the warning.

Best regards,
-Steve

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 Post subject: Re: TTT630PLK vs. Simpson 260-4 thru 7P VOM designs similari
PostPosted: Nov Wed 23, 2011 8:30 pm 
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Fred Scoles wrote:
Next comes the model 630-L, which was the very first VOM having the "sexy-looking" big clear lucite window, with the large red "luscious" (as another ARFer wrote just last week) knob, and the "L" featured a "low power OHms" scales (not enough power to trigger forward biasing in either a Ge or Si chip) w/o any active components inside....quite a feat at the time...but to do that they had its Ohms scales running backwards, which drives most of us nuts to use this model.


Hi Fred,

Thanks for the excellent summary of the Triplett 630 series lineup. The 630-L sounds very interesting, I hadn't come across this model before. Thanks!

Best regards,
-Steve

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 Post subject: Re: TTT630PLK vs. Simpson 260-4 thru 7P VOM designs similari
PostPosted: Oct Sat 13, 2012 9:40 am 
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Mr. Fred Scoles,
I see that in the past you had written an article regarding the Triplett 631 and it's no longer available 22.5 volt batteries. I have recently acquired a 631 and would appreciate any information you may have regarding substitution of the Burgess No. XX15 battery.
Thanks for you help.
John


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 Post subject: Re: TTT630PLK vs. Simpson 260-4 thru 7P VOM designs similari
PostPosted: Oct Mon 15, 2012 5:15 pm 
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John, PM to me your email address, so I can email to you the Triplett 631 battery article to you as an MS Word attachment. The article was on triplett.com site from '03 thru '07, when Jewell web-management decided to remove it and a number of older articles & references. My original version (on MS Word '97) also didn't display the photos reliably with newer versions of MS Office software, so it has been upgraded and should work on your computer.

There have also been various other battery replacement/upgrade plans for the TTT631 written by others, in varying degrees of usefulness. Back in '03 when I wrote my version, there were a few battery replacement plans previously on the web for the 631 that I considered not good & not well thought out, which provided the incentive to write a better article, which was approved and edited by the Triplett web designer in Bluffton for their site.


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 Post subject: Re: TTT630PLK vs. Simpson 260-4 thru 7P VOM designs similari
PostPosted: Oct Mon 07, 2013 6:49 pm 
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Fred Scoles wrote:
Next in line in the TTT 630's is model 630-M, which went thru only 2 production runs, and a total of six of them were ever made and according to Mr. Ropp Triplett (pres when I was growing up), only two of them got out the door to a distributor. Just last year on Ebay I bought the only surviving example of an "M" and it is in perfect, original condition....and it has no known $$$$ value assigned to it as I have the only known example in my collection. Simpson never ever had anything like it. My "M"'s native mvt is 1ua fs for 1 million Ohms per volt DCV, and 500,000 opv with the slider kicked to the Right (it looks identical to a 630-na or ns on the outside); inside it's totally different though simply because at that high sensitivity they could not use the regular bakelite resistor holder turrest because the bakelite attracted too much static and/or summer humity, so it as a special circuit board and white nylong sleeves around its panel jacks. I snagged it last yr off Ebay simply because I was the only soul on earth who even knew what it was.

Fred, are you sure about there only being six 630-M's produced? I just picked one up from Craigslist, and one sold on eBay recently:
http://www.ebay.com/itm/ws/eBayISAPI.dl ... 1134328536

The instruction manuals seem to be pretty plentiful on eBay, too.

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 Post subject: Re: TTT630PLK vs. Simpson 260-4 thru 7P VOM designs similari
PostPosted: Oct Mon 07, 2013 8:35 pm 
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I don't know how many M's were made or sent to distributors, but far fewer were made than any other model VOM. Workers at the plant I had talked with definitely didn't enjoy building or calibrating them because of their sensitivity and susceptibility to circuit board contamination, and the difficulty selling-distributing them. They were roughly twice the price of the NS, part of it due to the labor and time to calibrate. I don't know why there seem to be stockpiles of the M manuals; I saw several boxfuls of the new manuals in the warehouse just after the plant shut down; but for whatever reason, none of the M engineering files survived or could be found. At one time, Cenco and SargentWelch offered Triplett 630-M and 601, 602, & 603 (transistorized VOM's) to schools, but few sold and much of their stock was later landfilled.


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 Post subject: Re: TTT630PLK vs. Simpson 260-4 thru 7P VOM designs similari
PostPosted: Jul Mon 07, 2014 4:33 pm 
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Thank you all for this thread. It's been very imformative and useful.

I just picked up an "M" on eBay (or what purports to be one). Mine's in rougher shape. When it arrives, I'll take photos in case anyone's interested.

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 Post subject: Re: TTT630PLK vs. Simpson 260-4 thru 7P VOM designs similari
PostPosted: Jul Mon 07, 2014 5:00 pm 
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I'm in the process of scanning the manual for the 630-M. I'll put it up for download and let everyone here know the URL when it's ready.

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 Post subject: Re: TTT630PLK vs. Simpson 260-4 thru 7P VOM designs similari
PostPosted: Jul Wed 09, 2014 3:40 am 
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James, I think that 630-M went through only one "Type 1" major design, so all M's should have the thick fiberglassed flat circuit board construction; not the normal 630 series black bakelite round resistor turret. Will yours come with the standard black-bakelite case bottom, or the optional clear-acrylic bottom? For whatever reason, none of my archive papers include the 630-M engineering or marketing files, so I don't know the official reasons they went with the flat component board design instead of the bakelite rotary turret the other 630's used.


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 Post subject: Re: TTT630PLK vs. Simpson 260-4 thru 7P VOM designs similari
PostPosted: Jul Wed 09, 2014 6:15 am 
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I first heard about the Triplett 630-M in the post above in this thread from Fred Scoles.

I found one locally that has an unbalanced meter movement. It appears to be in calibration when sitting horizontally on the workbench, but the zero changes if I stand it vertically.

Image
(Full size image here.)
I haven't torn into it yet, but I did open it up and take a photo of the internals. Perhaps they had to go with a glass-epoxy circuit board to get the leakage currents low enough for the 1 µA (!) meter movement.

Fred was kind enough to send me a manual for the 630-M, which I have scanned and put up for download in my Liberated Manuals section.

http://www.byan-roper.org/steve/manuals ... _630-M.pdf

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