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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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Latest weather from Environment Canada Hamilton Current Conditions Cloudy 41^ °F Observed at: Hamilton Munro Int'l Airport Date: 10:00 PM EST Thursday 11 March 2010 Condition: Cloudy Pressure: 29.89 inches Tendency: rising Visibility: 15 miles Temperature: 40.5°F Dewpoint: 34.2°F Humidity: 78 % Wind: NE 21 mph ForecastTonight Showers 41°F Fri Showers 46°F Sat Periods of rain 43°F 37°F Sun Chance of showers 45°F 37°F 60%Mon Chance of showers 45°F 37°F 70%Tue Sunny 46°F 30°F Wed Sunny 46°F 27°F Issued : 3.30 PM EST Thursday 11 March 2010 Tonight Clear. Increasing cloudiness late this evening with showers. Wind east 20 km/h becoming light after midnight. Low plus 5. Friday Showers. Wind becoming northeast 20 km/h in the afternoon. High 8. Friday night Cloudy. 60 percent chance of showers in the evening. Rain beginning near midnight. Wind northeast 30 km/h. Low plus 3. Saturday Periods of rain. Windy. High 6. Sunday Cloudy with 60 percent chance of showers. Windy. Low plus 3. High 7. Monday Cloudy with 70 percent chance of showers. Low plus 3. High 7. Tuesday Sunny. Low minus 1. High 8. Wednesday Sunny. Low minus 3. High 8. Historical Data Yesterday Max: 43.2°F Min: 29.1°F Precip: Trace Normals Max: 39°F Min: 23°F Today Sunrise: 6:39 Sunset: 18:20