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Title: Hiwatt 504 mute as a fish Post by: prnet on October 14, 2009, 08:56:28 PM ???
Hello everyone.. I just finished building my heywhat 504.. but no sound at all.. no hum.. no hiss. :-\ I found 340v at pin 1 and 6 of the preamo tubes that I guess that is too much.. after the diodes bridge the voltage is about 450v, then go trough the 100ohm/5w resistor.. i used a 22uf and a 32uf instead of the 32+16uf caps. maybe could it be the matter of the high voltage problem? anyway, I checked the voltage before turn on it.. the others seems to be ok, I found the 450v at the HT of the output central.. and about 450/500v (dont' remember exactly) at the el34 pin 3. Nothing burned when I turned on... so I think that the problem could be a discontinuity in the preamp. How could I verify it ? thanks Paolo |