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 Post subject: homebrew contest
PostPosted: Jul Thu 16, 2015 3:25 pm 
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Location: aston, pa, usa
I was trying to come up with an interesting project for new homebrewers:

1) I thought of Tom Bryants nostalgia style 6888

2) Looked around and picked a radiola III-A as a target cabinate to make
http://www.radioatticarchives.com/radio.htm?radio=8408
So, I thought of adding a 6SQ7 audio tube to get 4 tubes

3) The Radiola made me think of Bill M's shelf queens and maybe we could get his input

4) The Radiola cover plate made me think of Big Nick's cover plates and maybe we could get his input

5) Looking for ideas

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Last edited by bill hamre on Jul Sat 18, 2015 5:25 pm, edited 1 time in total.

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 Post subject: Re: homebrew contest
PostPosted: Jul Fri 17, 2015 2:05 am 
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Location: aston, pa, usa
http://www.sparkbench.com/homebrew/homebrew.html
------------------------------------------------------------
Bill M's homebrews link

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 Post subject: Re: homebrew contest
PostPosted: Jul Fri 17, 2015 2:16 am 
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Location: aston, pa, usa
http://www.bignick.net/Morgan_Radio/Radio.htm
-----------------------------------------------------
Big Nicks homebrew link

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 Post subject: Re: homebrew contest
PostPosted: Jul Fri 17, 2015 11:19 am 
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Location: aston, pa, usa
housing idea:

What do newbies who might build think about pre-finished ikea type construction included with parts kit?

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 Post subject: Re: homebrew contest
PostPosted: Jul Fri 17, 2015 11:22 am 
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Location: aston, pa, usa
iron idea:

To do something about tranny, buy qty 100, 120v/6v. Use 3 per parts kit. use 1 as primary, next 2 in series to get 240v secondary with a 120v chassis ground.

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 Post subject: Re: homebrew contest
PostPosted: Jul Fri 17, 2015 11:26 am 
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Location: Mount Pleasant UT 84647 (from Coventry, UK)
I think this is a great idea, thanks for suggesting it. I have never built anything like this before, so it would be a valuable learning experience. The biggest hurdles to overcome, from what I can see, would be making the faceplates and winding coils. I'm guessing that quality of workmanship will be the main criterion on which the contest is judged?

Edit: I just read your post about the housing. I for one would welcome the Ikea-style construction, as I have no way to make a cabinet that would look even halfway decent.

Colin


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 Post subject: Re: homebrew contest
PostPosted: Jul Fri 17, 2015 12:56 pm 
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Location: aston, pa, usa
Thanks for posting Colin! We don't often get the new to homebrewing types saying much on homebrew threads. Your opinion is welcome. Bill

Can someone come up with a hand wound coil? Anything possible in #14 solid, say 1 inch in diameter just to make it doable? Maybe Bill M can come up with ikea style spec on housing, sexy socket head cap screws using an allen wrench with gold or black barrel bolt nuts showing? I'll stain them, then spray multiple coats of polyurethane?

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 Post subject: Re: homebrew contest
PostPosted: Jul Fri 17, 2015 1:37 pm 
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Location: aston, pa, usa
tuned circuit ideas:

Store bought slug, hand wound coil or toroid? Options for all with more points for hand wound!

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 Post subject: Re: homebrew contest
PostPosted: Jul Fri 17, 2015 6:29 pm 
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Location: aston, pa, usa
drop-in idea:

Option to make a 6GY6 drop-in. If component values change add a two position rotary switch.

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 Post subject: Re: homebrew contest
PostPosted: Jul Fri 17, 2015 10:38 pm 
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Location: Vieques,PR 00765 USA
Bill, give us a link to Bob Weaver's project or post. I'm still not tuned in yet. :)

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Visit my homebrew page
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 Post subject: Re: homebrew contest
PostPosted: Jul Fri 17, 2015 11:20 pm 
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Bill M,

Thanks for your interest. I've got a hard copy of the schematic but can't find the thread. I'll try to scan it and post the schematic on here. The tube line up is 6X5, 0A2 and 6888. I'll add a 6SQ7 and post it too on a separate schematic.

Bill

EDIT: P.S. 0A2 can be substituted with 0D3 to make qty 4 octals.

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 Post subject: Re: homebrew contest
PostPosted: Jul Sat 18, 2015 2:51 pm 
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If you need someone to build a prototype, I wouldn't mind having a go at it. As someone who has completed a few solid state projects (including the LM386 transmitter) but never a tube radio, I probably fit the target audience for this project, and would be happy to be the "Guinea Pig".

Colin


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 Post subject: Re: homebrew contest
PostPosted: Jul Sat 18, 2015 3:04 pm 
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Location: aston, pa, usa
Colin,

I'll start sending parts for prototype. I know you work and can't post pics that often of progress. That could be a good thing with other newbies and lurkers watching the build as it happens.

Thanks,

Bill

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 Post subject: Re: homebrew contest
PostPosted: Jul Sat 18, 2015 3:09 pm 
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Location: aston, pa, usa
After much random computer pounding I finally got a lead on this schematic. That's the good news. Bad news is that I can't move it to here and post it. I googled up: 6x5,0a2,6888 schematic. Once anything came up I hit google images. It's top right. Maybe because I'm on the road. Can anyone copy and paste it to here for me?

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 Post subject: Re: homebrew contest
PostPosted: Jul Sat 18, 2015 3:55 pm 
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Location: aston, pa, usa
http://www.freewebs.com/franitzasab/6888v1.jpg
-------------------------------------------------------
this is the schematic

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Last edited by bill hamre on Jul Sat 18, 2015 5:27 pm, edited 1 time in total.

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 Post subject: Re: homebrew contest
PostPosted: Jul Sat 18, 2015 4:01 pm 
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Location: aston, pa, usa
viewtopic.php?f=12&t=221968
-----------------------------------------------------------------------------------
Finally found the thread. I don't know why I thought it was Bob's when it was Tom's

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 Post subject: Re: homebrew contest
PostPosted: Jul Sat 18, 2015 9:52 pm 
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Location: Vieques,PR 00765 USA
Here ya go. Just to keep it with the thread:

Attachment:
6888v1.jpg
6888v1.jpg [ 35.55 KiB | Viewed 5716 times ]

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Visit my homebrew page
www.sparkbench.com/homebrew/homebrew.html


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 Post subject: Re: homebrew contest
PostPosted: Jul Sun 19, 2015 1:37 am 
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Location: aston, pa, usa
Thanks Bill M!

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 Post subject: Re: homebrew contest
PostPosted: Jul Sun 19, 2015 5:13 pm 
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Location: aston, pa, usa
http://www.nj7p.info/Tube/SQL/Tube_query.php?Type=0D3
----------------------------------------------------------------------
I copy and pasted 0D3 link above for the pin out change from 0A2.
I used nj7p as nostalgia air tubes is down.

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 Post subject: Re: homebrew contest
PostPosted: Jul Mon 20, 2015 12:05 am 
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Ok, time for action. I whipped up a little box today in my sidewalk woodshop as pictured. Two milk crates serving as a seat and a worktable. Note the absence of a table saw. A jigsaw + belt sander does the job! Haha.

This is halfway decent mahogany veneered 1/2" plywood scrap that I had laying around. The panel is 9x4 which should handle 4 tubes and is 1/8" Garolite, a phenolic type material.

I'm in touch with Colin about using this as our prototype example and would like some suggestions on possible layout, etc. I'll let Colin build the thing.

What I'm thinking about is 4 sockets on the panel although recessed sockets would be cool. Can't recess the sockets too far because ya ain't supposed to go pulling on the glass envelopes, ya know. Nothing else on the top panel other than the tubes, binding posts for ground/antenna, input jack and volume pot. Maybe an adjustment hole for the tuning cap. The power transformer and ps components would be mounted on a small subchassis underneath. All the other wiring is pretty much point-to-point. The whole idea being to allow the complete xmtr to be slid out of the wooden cabinet for construction and maintenance.

So before I wind up the drill I'd like to hear some other ideas about what YOU would do.

Attachment:
contest1.jpg
contest1.jpg [ 146.21 KiB | Viewed 5538 times ]


Attachment:
contest2.jpg
contest2.jpg [ 85.98 KiB | Viewed 5538 times ]

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Visit my homebrew page
www.sparkbench.com/homebrew/homebrew.html


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