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Topics - Sfmag1

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1
Amplifier Discussion / Transistors for Unicord Stage 65b Amp
« on: May 26, 2019, 05:50:24 AM »
Hello. I'm trying to locate and purchase these TO-92 case audio transistors in a 1977 japanese made amp but even a google search does not recognize the numbers. Any help or suggestions? Thanks

C693F7F
A640E76
C1175E7F
C536G7C
A659E6G

2
Amplifier Discussion / Unicord Stage 65b Output Transistors
« on: April 29, 2019, 02:00:22 AM »
Hello. I have been working on a Unicord "Stage" 65b amplifier and ordered and installed replacement output transistors Sanyo B507E and D313E. They work alright with a signal from a generator or guitar at very low volume but  heat up and will burn/short out completely if left on with a louder volume setting. The sound is good out of an 8 ohm speaker until it is turned up, then they heat up. They would be normally mounted to the chassis to dissipate heat but they are burning hot anyway. The speaker reads ok at 8 ohms. I am suspecting the Chinese transistors I bought from e-bay are cheap junk and that is the problem. Any experience or advice on this? Should I buy an equivalent?
Tx

3
Schematics and Layouts / Univox Stage 65b
« on: March 28, 2019, 09:12:59 AM »
Hello. I'm looking for a schematic for the Stage 65b amp head. I've looked on the internet to no avail so far. Can anyone help out or steer me in the right direction? :dbtu:
Tanks.

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