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 Post subject: Silvertone 1448
PostPosted: Sep Mon 10, 2012 9:58 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 4866
Location: Gainesville, Florida
always wanted one of these

Image

heres the print
http://www.webphix.com/schematic%20heav ... e_1448.pdf
check-it-out


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 Post subject: Re: Silvertone 1448
PostPosted: Sep Tue 11, 2012 3:13 am 
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Posts: 8432
Location: Minnesota
Very very cool. Love the sound of those Danelectro lipstick pickups.


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 Post subject: Re: Silvertone 1448
PostPosted: Sep Tue 11, 2012 1:07 pm 
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Location: Raleigh NC USA
Back in May, I repaired a Harmony practice amp with the same tube lineup (12AU6, 50C5, 35W4). Its circuit was almost identical to this one, isolation transformer and all.

Larry

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 Post subject: Re: Silvertone 1448
PostPosted: Sep Tue 11, 2012 8:38 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 4866
Location: Gainesville, Florida
not much to it is there. should be arriving soon. new toy


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 Post subject: Re: Silvertone 1448
PostPosted: Sep Fri 14, 2012 3:07 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 4866
Location: Gainesville, Florida
its more of a toy than I thought. a little small. short neck. a novelty and is collectible. more time to fool with it this weekend. run it through the mill. seeking improvement possibilities. the usual new components and cleaning as well as mod considerations. who knows maybe 12AX7 in place of 12AU6. additional gain control. different output transformer. speaker


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 Post subject: Re: Silvertone 1448
PostPosted: Sep Fri 14, 2012 9:41 pm 
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Joined: Nov Sat 27, 2010 6:15 pm
Posts: 5449
I'd leave it alone other than a recap and recarb job.


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 Post subject: Re: Silvertone 1448
PostPosted: Sep Fri 14, 2012 9:57 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 4866
Location: Gainesville, Florida
it is in excellent condition. always could put it back to original after modified
that is the actual photo. original tubes everything. cool toy


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 Post subject: Re: Silvertone 1448
PostPosted: Sep Fri 14, 2012 10:19 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 4265
Location: Boston, MA USA
It's very dangerous. There is nothing between you and the power line except a 0.05 uF capacitor in parallel with a 68k resistor. This is one I would put on the shelf and look at.

-David


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 Post subject: Re: Silvertone 1448
PostPosted: Sep Sat 15, 2012 5:44 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 4866
Location: Gainesville, Florida
I dont share your fear. caution yes. fear no. it is sort of an AC/DC set type amp with one side of power as ground. something to consider but not fear


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 Post subject: Re: Silvertone 1448
PostPosted: Sep Sat 15, 2012 6:18 pm 
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Joined: Nov Sat 27, 2010 6:15 pm
Posts: 5449
Three prong plug properly wired and lose "death capacitor" is only safe if wall recepticle is properly wired. Else clean socks and dry sneakers and you might survive to your dotage.


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 Post subject: Re: Silvertone 1448
PostPosted: Sep Sun 16, 2012 1:27 am 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Gainesville, Florida
may not be UL approved but everyone else survived the 60s. so will I


Last edited by tubeAMP on Sep Mon 17, 2012 1:23 pm, edited 1 time in total.

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 Post subject: Re: Silvertone 1448
PostPosted: Sep Sun 16, 2012 1:51 am 
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Posts: 4265
Location: Boston, MA USA
tubeAMP wrote:
may not b UL approved but everyone else survived the 60s. so will I

Suit yourself -- but don't play it outdoors.

-David


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 Post subject: Re: Silvertone 1448
PostPosted: Sep Mon 17, 2012 1:30 pm 
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Location: Raleigh NC USA
And don't waste your time "modding" it. With a single 50C5 for output (that's a table radio output tube, remember!) you may see two or three watts at most. That single 12AU6 will give it all the gain it can handle without distorting.

Larry

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It don't make a go if it ain't got that GLOW!


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 Post subject: Re: Silvertone 1448
PostPosted: Sep Mon 17, 2012 1:44 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 4866
Location: Gainesville, Florida
similarly about the same as SE 6V6. there are amps with 12AX7 pre-amp into 6V6. two stage pre-amp instead of one. I have never see anyone playing outside other than on stage. usually wood. but I have seen electro-dance when they grabbed the mic stand or sparky lips on the microphone. usually followed by fowl language. no doubt backward grounds and these were not using silvertone in a box gear for certain

Image


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 Post subject: Re: Silvertone 1448
PostPosted: Sep Tue 18, 2012 3:08 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 4866
Location: Gainesville, Florida
looking at tube data 50C5 is a lower operating voltage similar tube to 6V6 higher operating voltage tube. Im thinking that two stage 12AX7 larger signal may work just as well with 50C5 as 6V6. if anything adjusting R7 150ohm higher to 200ohm to handle larger input

http://www.webphix.com/schematic%20heav ... e_1448.pdf


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 Post subject: Re: Silvertone 1448
PostPosted: Sep Tue 18, 2012 3:18 pm 
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Posts: 6552
Location: Raleigh NC USA
BigBandsMan wrote:
And don't waste your time "modding" it. With a single 50C5 for output (that's a table radio output tube, remember!) you may see two or three watts at most. That single 12AU6 will give it all the gain it can handle without distorting.

Larry


Q.E.D.

It's better to leave that unit alone, leave it original for the sake of its collectibility.

_________________
It don't make a go if it ain't got that GLOW!


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 Post subject: Re: Silvertone 1448
PostPosted: Sep Tue 18, 2012 3:31 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 4866
Location: Gainesville, Florida
it can always be returned to original. the idea is that it should show larger signal output with two stage input. actually distortion is useful in tube guitar amplification. odd harmonics and all that jazz create what is considered desirable sustain


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 Post subject: Re: Silvertone 1448
PostPosted: Sep Tue 18, 2012 3:34 pm 
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Location: Raleigh NC USA
(shrug)

L

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It don't make a go if it ain't got that GLOW!


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 Post subject: Re: Silvertone 1448
PostPosted: Sep Wed 19, 2012 3:37 am 
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Joined: Jan Thu 22, 2009 1:22 am
Posts: 379
Location: Mpls
I got one of these for a girl I knew ages ago for $150, and wish I knew where she was!

It was a great idea actually, as it was never supposed to be anything more than a practice amp, and you could stick it all under your bed. I would have no problem with a recap or even a grounded plug. As long as you aren't like the dingbats that used to drill holes in the front of old Bassman and Bandmaster heads to put a master/OD
in there, mod away. Reversible is reversible. Drills are not. Hop it up and have fun.

The charm of these things is that for honked out authentic blues tone, the guitar and the amp are the real deal.
I prefer Harmony Stratotones myself, but these are cool.


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 Post subject: Re: Silvertone 1448
PostPosted: Sep Thu 20, 2012 7:41 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 4866
Location: Gainesville, Florida
all Ive done so far is replace the power supply filters. sounds kind of flat. not much to write home about. maybe getting rid of these green plastic coated signal capacitors will improve performance. not much of an output transformer. similar size as a bakelite table top radio. I do have a Fender Champ type to try if I get motivated. but first to see what it was supposed to sound like with new signal capacitors. not impressed so far. not what I would call 'Blues tone' yet.


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