Made in Japan
Year circa '60s(?)
This is a one channel, Class-A (Single-Ended) all-tube guitar amp that puts out about 4W of power to one 6" speaker. There are four (7-pin) vacuum tubes specifically 2 x 6AV6 as preamp tubes, one 6AR5 power tube and one 6X4 rectifier tube.
This amp was marketed internationally under Teisco, Beltone, Northland, Takt and other brand names. There is a similar model with an additional 6AV6 tube and corresponding circuitry and controls for 'tremolo' effect. These 'tremolo' equipped models usually has 2 speakers.
It has 2 inputs, one volume and one tone control knobs, on-off switch and pilot lamp. I like the quality look and feel of the panel and its components.
The power transformer has a 110 and 220 Volt tap and a vintage knife-type SPST voltage selector switch.
There is very little information about teisco amps on the internet, I have not found any schematic so far.
I expect that the circuit would be very similar to vintage Gibson Kalamazoo Model One and Fender Champ 600 amps. The two 6AV6 preamp tubes in the Teisco would be equivalent to the two triodes (V1a and V1b) of the 12AX7 in the Kalamazoo Model One, shown below.
Schematic author is Miles O'neal of Austin, Texas and is originally from http://www.rru.com/~meo/Guitar/Amps/Kalamazoo/M1/schem.html
I added a phono plug and jack so that an external speaker can be conveniently plugged-in instead of the internal 6" speaker. I will fix the jack in a bracket to make it more secure and elegant looking.
No comments:
Post a Comment