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After finally taking a good look at the chassis tube markings (thanks to my reading glasses) on a piar of Fisher 100 mono amps i noticed that EL37 is silkscreened near the sockets, so after going to Duncanamps data site i noticed that the heater current draw is more like the KT-66 1.4 for the EL37, 1.25 for the KT-66, but the EL37 has a plate voltage of 400Vlike a 6l6G! , while the KT66 is 500V, so as far as the current draw would i be able to use KT-66' tubes? If so then there would be less output then what a KT66 would normally put out with 500V to the plates, since it would most likely only see 400V fom use in the Fisher 100 amps which are designed around the EL37? And if im correct, since the amps run 400 v to the plates then i can safely use 6l6G cokes?? and just about any 6l6 tube out there??.
Frank
Follow Ups:
That's my experience.
Have you done any tube rolling with your 100's in the time that you have had them, If so have you used the balance pot ea time you used different tubes, i am waiting for a scheme from someone i know who has one for sale. Im wondering now if that pot is for AC balance or a hum pot?
What do you know about that pot?????
Frank
Leave the pot alone. It's factory set. If it needs changing, let a qualified tech do it.
The pot is for AC balance. You apparently don't look for follow ups to the posts you made previuosly about this very same subject.
Sometimes i loose track of situations when im involved with more then one project, i get too ahead of myself understand? But i guess you took care of that!
Frank
KT-66 will be the ideal match, 6L6GC will work safely (but not sound as good), BUT anything below the 6L6GC - that is, a 6L6G or GA in particular - will fry completely in no time at all.
What you need are 6L6-compatible tubes with:
1. The same or HIGHER maximum screen and plate voltages than the indicated EL37
2. The same or LOWER heater current than the EL37
3. The same or HIGHER plate and screen dissipation ratings as EL37You should be OK with any KT66 or 6L6GC. I am not so sure about other 6L6 types. Look on Duncanamps or elsewhere to get the exact specs.
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