Hi Gang!
A friend has found a Fisher SA-300 Tube Power Amp that is without tubes and he needs a Schematic to get some help from an experienced Guitar Amp friend.
Can anyone make any recommendations for the Schematics and/or Tubes and/or Gotchas.
Thanks as always in advance! 😀
A friend has found a Fisher SA-300 Tube Power Amp that is without tubes and he needs a Schematic to get some help from an experienced Guitar Amp friend.
Can anyone make any recommendations for the Schematics and/or Tubes and/or Gotchas.
Thanks as always in advance! 😀
You can get the schematic from HIFI Engine, after registering.
The tube complement is 2X 12AX7/ECC83s, 2X 12AU7/ECC82s, 2X matched pairs of EL34/6CA7s (4X power tubes total), and 2X 5AR4/GZ34s.
BTW, Fisher's 45 WPC claim is HIGHLY optimistic. That comes from before FTC rules were put in place. A yield of 35 WPC RMS is about right from a PP pair of EL34 family tubes.
The tube complement is 2X 12AX7/ECC83s, 2X 12AU7/ECC82s, 2X matched pairs of EL34/6CA7s (4X power tubes total), and 2X 5AR4/GZ34s.
BTW, Fisher's 45 WPC claim is HIGHLY optimistic. That comes from before FTC rules were put in place. A yield of 35 WPC RMS is about right from a PP pair of EL34 family tubes.
Thank you Eli.
Always a Gentleman here!
I saw 30 WPC in a few references. They seemed to held in high regards for an early 60's amp.
Hopefully, he'll join HiFi Engine and download it but I think he might have tried that and found what they had wasn't complete.
I'll check with him.
Thanks again!
Regards//Keith
Always a Gentleman here!
I saw 30 WPC in a few references. They seemed to held in high regards for an early 60's amp.
Hopefully, he'll join HiFi Engine and download it but I think he might have tried that and found what they had wasn't complete.
I'll check with him.
Thanks again!
Regards//Keith
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