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Audio and Video Talk
Vinyl
The Curious Case of the missing Valve(s)...
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<blockquote data-quote="croak" data-source="post: 47164" data-attributes="member: 361"><p>It looks to me like the GZ32 rectifier (powersupply) valve is missing. It has probably been replaced with two teeny wee more modern diodes tucked away under the hood and soldered on to the valve bases. If done correctly with the approriate voltage drop allowed for this is fine. I preferred the sound of tube rectifier when I tried this though...</p><p>If not done right, ie just replaced valve with diodes, no further voltage drop method, the actual voltage on which the amps now run may be a liitle high.</p><p>Our member ampdog knows these amplifiers quite well and can no doubt advise on the correct way of doing the diode modification.</p><p>I may be wrong and the substitution may be without drawback.</p><p></p><p>PS:Typically the rectifier tube vs diodes forces the amp and other tubes in to a slow start, this way only the rectifier tube takes a beating on power up as opposed to all the tubes if solid state diodes are used. Then agin, many modern tube amps work this way.</p><p></p><p>Tube and valve are the same thing, just depending which side of the ocean you are on....</p></blockquote><p></p>
[QUOTE="croak, post: 47164, member: 361"] It looks to me like the GZ32 rectifier (powersupply) valve is missing. It has probably been replaced with two teeny wee more modern diodes tucked away under the hood and soldered on to the valve bases. If done correctly with the approriate voltage drop allowed for this is fine. I preferred the sound of tube rectifier when I tried this though... If not done right, ie just replaced valve with diodes, no further voltage drop method, the actual voltage on which the amps now run may be a liitle high. Our member ampdog knows these amplifiers quite well and can no doubt advise on the correct way of doing the diode modification. I may be wrong and the substitution may be without drawback. PS:Typically the rectifier tube vs diodes forces the amp and other tubes in to a slow start, this way only the rectifier tube takes a beating on power up as opposed to all the tubes if solid state diodes are used. Then agin, many modern tube amps work this way. Tube and valve are the same thing, just depending which side of the ocean you are on.... [/QUOTE]
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Audio and Video Talk
Vinyl
The Curious Case of the missing Valve(s)...
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