Need Schem for Teisco Checkmate-15 tube amp

[RedHouse]

Need Schem for Teisco Checkmate-15 tube amp, ...anybody?

[Enzo]

How close are the 18 and 20 on SChematic Heaven?

[RedHouse]

Dunno how close, I got a Checkmate-20 schem (not from Schem Heaven) but I don't have the unit on the bench yet to see.

I'm trying to do some preliminary research before the unit arrives, I've never seen one of these amps before.

[Enzo]

I draw my own all the time. A simple amp like this shouldn't take more than 20-30 minutes. Especially if it is similar to the others. Then you can rough the drawing out beforehand.

[RedHouse]

Yes, I do too.

My request was not of despiration, it's just that I've learned over the years that every single thing that comes across my bench needn't be a throw-down challenge.

I often try to minimize my time by gathering data/info/schems of units I work on. I have a long list and it doesn't seem to get any shorter.

Thanks for your input though,

-Brad

[Enzo]

I understand. I have been slowly uploading my collected stuff to LArry at Schematic heaven, and elsewhere as seems appropriate. The Schematic Heaven site and Aspen Pitmann's disc are a good start to a collection. Somewhere I have an old Sams book which includes a lot of old odd amps.

[RedHouse]

Yeah archiving schems is a great thing, good'on'ya.

Speaking of SAMS, they used to have these things called Sams Photofacts which were like info packets on a series or Radios or TV's.

When I was a teenager just learning about electronics an old guy I knew who retired from his own old radio shop gave me his entire set of Sams Photofacts, it was like 6 big 'ol boxes of 'em literally hundreds, with all kinds of tube based appliances.

Well this was back in the late 60's/early 70's when everything was going to solid state and except for guitar amps and old Bogen PA's (which were not in the photofact set's) well I never ran into anything to use them for, everybody was ditching their tube stuff and buying solid state stuff... so I tossed them out... boy was that a bad move, I've regretted it ever since the late 80's when tube stuff started being popular again, specially the tube HiFi market.

Sheesh! live-n-learn I guess.

-Brad

[Enzo]

Threw out a Photofact collection? Go sit in the corner. I still have service manuals for littel Perpetuum Ebner phonograph players. And I cannot make myself heave the old GE stereo record player manuals.

A friend brought over a little three tube record player amp that we messed with. I don't know what it was, but a schematic for it now resides in my files.

[RedHouse]

Just to follow up on this, it turns out the Checkmate-15 and Checkmate-20 are close enough to use the same schem-o.

I located the Checkmate-20 schematic on the internet and when the Checkmate-15 amp came across my bench I checked it against that schem-o, only a couple of very minor differences, like the voltage-doubler circuit (.002 caps across the diodes) and a different voltage on the plate's (320vdc).

The Teisco was a very well built amp I must say, never seen one before this and I was impressed with most of it (except the cheasy voltage-doubler power supply like Danelectro/Silvertone) it used PiO caps in the audio path and all wirewound resistors.