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Audio and Video Talk
Valves / Vacuum Tubes
Please help identify rectifier
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<blockquote data-quote="El Sid" data-source="post: 829456" data-attributes="member: 18550"><p>I should have mentioned that the heater supply is 5V - marked on the transformer. I think it can't be a GZ34 because the supply is taken off pin 2? But as suggested I could change the wiring. Are 5U4s or GZ34s more readily available/cheaper?</p><p></p><p></p><p></p><p>Hi FD - I also thought the valves should be the same, but they are the ones that were in there when the amp was last functional. So I looked at how it is connected, and the input signals both go to the same valve (the right one) and then to the left valve and hence to the EL84s. So i thought that the first stage would be the ECC81s because of their higher gain, and the ECC82s for the phase splitter since gain = 1 for that stage so the lower-gain ECC82s suitable.</p><p></p><p>But i will trace the circuit as I'd firstly like to get it working as originally conceived. There are a few loose wires here and there! Then I want to use it as a testbed for various configurations.</p></blockquote><p></p>
[QUOTE="El Sid, post: 829456, member: 18550"] I should have mentioned that the heater supply is 5V - marked on the transformer. I think it can't be a GZ34 because the supply is taken off pin 2? But as suggested I could change the wiring. Are 5U4s or GZ34s more readily available/cheaper? Hi FD - I also thought the valves should be the same, but they are the ones that were in there when the amp was last functional. So I looked at how it is connected, and the input signals both go to the same valve (the right one) and then to the left valve and hence to the EL84s. So i thought that the first stage would be the ECC81s because of their higher gain, and the ECC82s for the phase splitter since gain = 1 for that stage so the lower-gain ECC82s suitable. But i will trace the circuit as I'd firstly like to get it working as originally conceived. There are a few loose wires here and there! Then I want to use it as a testbed for various configurations. [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
Please help identify rectifier
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