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RE: These 300B came in today and they Tube DIY asembled but didn't work

Posted by Thorsten (M) on April 13, 2014 at 11:26:51

In Reply to: These 300B came in today and they Tube DIY asembled but didn't work posted by Michael Samra on April 12, 2014 at 20:00:29:

Hi Michael,

Just a note, there is no SCR (Silicone Controlled Rectifier) in this.

If you need help trouble shooting, drop me a line.

The Mosfet's on the Main Power Boards (IRF830 for +B and some 500V Fairchild P-Channel ones for the -C - sorry I forgot the part number) are a bit fragile. When they go usually the SMD LED's too go as do a lot of other 2 and 3 legged fuses on the boards.

If something blows up, best action is to completely re-build the boards, with all semiconductors replaced.

Also,try Raytheon 5687WB as driver and real WE 310A/B as Input Tube.

For rectifier I like brown base Coke Bottle 5R4G best, not greatly fond of the Chinese GZ34 that seem to be fitted, the Shuggie 274B is also a decent rectifier choice.

Best 300B to my ears in these where Full Music and KR/Vaic.

When in good nick and with decent tubes you should get around 15-16W RMS out of these Amp's, Class A2 past maybe 12W...

Thor

At 20 bits, you are on the verge of dynamic range covering fly-farts-at-20-feet to intolerable pain. Really, what more could we need?

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