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traynor
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I have a few traynor amplifiers, YBA-1, YVM-1, YGM-4 and a couple lent out
that I've forgotten about. YBA-1 is the Bassmaster, I'll get a picture up soon.
I've sold the YBA-1, gone to a good home in the States.
Here is a transcription of a Yorkville Sound Technical Note regarding the
rectifier circuit on YBA-1.
March 8th, 1972
Conversion of old YBA-1 with 5AR4 rectifier and 7072A output tubes to
solid state rectifier and 6CA7 output tubes:
The old circuit (1) fits on old circuit (2) at points A
B C D and E to convert the rectifier. It may be possible to fit some
of the PH204's right on the old 5AR4 socket as terminal points, or, solder
in a separate terminal lug strip.
The 6CA7 and the 7027A have the same tube biasing except
that you will have to connect G3 pin 1 to pin 8 externally for the 6CA7.
We suggest also a 1.5K 1/2W resistor in series with the G1 on pin 5 of
the 6CA7 to prevent oscillation. We suggest you reduce R30 from 56K to
47K to make the no signal grid bias voltage - 38V.
Except for the transformer voltages, circuit 3 shows the
amplifier converted to 6CA7's. The addition of the shock mount rubber
feet will insure longer tube life.
We have included the latest schematic for reference but
we do not recommend that you delete the choke in your conversion.
Yours truly,
YORKVILLE SOUND LIMITED
P.A. Hallam, P. Eng
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