Supertone Amp Video 2

30 04 2010




Supertone Video 1

27 04 2010




Supertone 2311 Circuitry Photos

31 03 2010

As you can see, a lot of the internal components need replacement.

Solar, Sangamo, Beaver and Mighty Mite caps all on display.





Supertone 2311 Tube Array

19 03 2010

This amp was made 79 years ago and the tube complement is a bit different than what is found in amps made in the 1950’s to present day.

The preamp tubes consist of a pair of 6N7 valves while the phase splitter is a 6F6GT and the output is provided by a 6F6-G tube. Rectification duties are handled by an 80 tube.

Ever seen another amp with these?





A Peek At The Backside

26 02 2010

As can be seen from the open back of the Supertone, this is actually a small combo amp.  The lack of a back panel really helps this little powerhouse disperse the sound.

The speaker is an 8 inch Jensen red label with the output transformer attached. The numbers on the speaker seem to be from an earlier dating system than most Jensens and I’m not sure of the year of manufacture.

Gloriously simple control panel featuring my favorite layout: one knob! A volume control is all I ever want with an amp anyway. Sweet little Supertone badge on the back, too.





1939 Supertone 2311 Tube Amp

5 02 2010

Prior to selling the Silvertone line of amps, Sears & Roebuck offered the lesser known Supertone brand.

This 2311 model dates from all the way back to 1939 and is the most recent addition to the dustyoldamp collection. The handle looks like it could be from 100 years ago but it is the only one on an amplifier that I have ever felt to actually fit comfortably in my hand while carrying the device.  I only wish this style of handle to be on every amp in my collection, particularly the heavier models.

The Supertone is aptly named as is sounds gorgeous.  Stay tuned to hear sound clips of this 71 year old beauty in action!





Stadium 400-T Circuitry Photos

30 11 2009

I wasn’t surprised that the Stadium amp had very little circuitry when I opened her up,  she sounds very direct and uncomplicated.

A real point to point beauty laid out intelligently and very little of the ‘rat’s nest’ jumble to deal with.

This little thing has a few wiring surprises such as the inputs going directly to the volume control before hitting any tubes or resistors.  More on that later as I plan to open up and analyze the circuitry of each amp that has been presented here to date.





Stadium 400-T Tubes And Speaker

19 11 2009

There are no markings at all on the speaker of the 400-T.  It’s an odd choice of speaker given the size of the cabinet and I have to admit to never having seen an oval shaped one in a guitar amp before. It looks like something intended for a car stereo setup but I can’t argue with the results of the sound.

The tube setup is a bit unusual as well.  The 35W4 rectifier is coupled with the 50C5 output for what looks like a the classic old radio trio but instead of the usual preamp companion of a 12AV6, we have a 12AX7! The 12AX7 provides more bite here than is generally found in amps that feature the radio tune lineup.





1958 Stadium 400-T Tube Amp

23 10 2009

1958 Stadium 400-T Tube Amp 1

A fried hard drive has canceled part two of the look at the circuitry of the Estey T-12, so we move right along.

1958 Stadium 400-T Tube Amp 2

This is a 1958 Stadium 400-T, a rare bird that is difficult to dig up documentation for, either online or in books. As can be seen from the slightly warped rear panel that adjoins the control plate, the wood on the amp is plenty thin.

1958 Stadium 400-T Tube Amp 3

I’ve never seen nobs like these and they are either plastic or perhaps bakelite. The handle and its mounting look to be straight off a piece of  late 1950’s luggage.

1958 Stadium 400-T Tube Amp 4

The brushed steel panel is somewhat like that of a vintage Fender but the lesser grade of metal doesn’t have quite the same shine. There are three inputs but it’s the middle port that provides the highest gain.





Strapless! Backside View Of The Estey

1 09 2009

1967 Estey T-12 Tube Amp Photo 4

The Estey T-12 is as humble around the back as she is up front.

1967 Estey T-12 Tube Amp Photo 5

And here’s a big reason why she sounds so sweet – Chicago’s finest – a blue label Jensen speaker.1967 Estey T-12 Tube Amp Photo 6

Date codes on the magnet cover peg this example from the 37th week of 1966, likely manufactured in September of that year.