Solid State Guitar Amp Forum | DIY Guitar Amplifiers

Solid State Amplifiers => Tubes and Hybrids => Topic started by: shovelheadsixsix on October 19, 2009, 03:44:55 PM

Title: stewart tube amp
Post by: shovelheadsixsix on October 19, 2009, 03:44:55 PM
anyone have any info on where this came from mail order,deptment store,combo with guitar,anything. I cant find any info . tubes 2@el84 2@12ax7 1@ez80
Title: Re: stewart tube amp
Post by: J M Fahey on October 24, 2009, 10:56:26 AM
Looks very "Silvertoneish" , probably made by them or some competitor. Should be very easy to trace; just do it and post the schematic, plus some "guts" pictures. I love bargain bin specials.
Title: Re: stewart tube amp
Post by: shovelheadsixsix on October 24, 2009, 08:08:58 PM
inside pics. hand drawn schematic,point to point wiring.I found this amp on garbage day at the curb took her home pluged her in and it worked fine.
Title: Re: stewart tube amp
Post by: J M Fahey on October 24, 2009, 09:55:51 PM
Well, it's not a Silvertone, it's not made of pressed cardboard, he he. Better for you.
Please re-take the schematic picture outside on a sunny day, to make it more readable.
Steady your hands with a chair or something and press the button slowly.
Beautiful amp, excellent bargain.
Title: Re: stewart tube amp
Post by: shovelheadsixsix on October 25, 2009, 07:51:02 AM
better pic.I can not find who ,what ,when or where at all on this thing
Title: Re: stewart tube amp
Post by: J M Fahey on October 25, 2009, 10:25:04 AM
Hi Stewart, thanks.
Well, readable enough.
Interesting little amp, and rises a few questions.
By the construction technique , it's very '60s, the golden age of department store tube amplifiers, in fact that panel and graphics are very "modern", *but* the style of drawing tubes, and the fact of using them "starved" (huge plate resistors, little or no bias resulting in low plate voltages), the general "economy of components", comes straight from the '40s, or even earlier, when components were scarce and expensive and you had to pull up to the last dB of gain from a tube.
I guess it was designed and built by some "old hand" , I mean somebody who was already old way back then, and with a lot of experience.
I think you have a jewel in your hands, it must sound good.
The speaker looks quite good too; if you could just provide some picture .... [:)]
Just for fun, play some White Stripes material through it, or some smokey Chicago Blues.
Title: Re: stewart tube amp
Post by: shovelheadsixsix on October 25, 2009, 02:25:14 PM
I have a date code book it say the speaker is from Quam-Nichols 1943 1953 or 1963 and the 41st week of year.#270341. cant seem to get pic to upload
Title: Re: stewart tube amp
Post by: J M Fahey on October 25, 2009, 02:38:23 PM
Very probably 63. Any earlier amp would have used 6V6's for the same power output.
Title: Re: stewart tube amp
Post by: shovelheadsixsix on October 25, 2009, 02:41:25 PM
thanks. this thing is still a mystery on where it came from
Title: Re: stewart tube amp
Post by: shovelheadsixsix on October 25, 2009, 02:52:55 PM
Is the speaker a good mfg.
Title: Re: stewart tube amp
Post by: J M Fahey on October 26, 2009, 08:45:24 AM
It's an old OEM manufacturer, and surprisingly still in business, considering the outsourcing-sickness that affects and is killing the US.