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Discussion Starter · #1 ·
I've got a question concerning the output tubes on my amp, any help would be appreciated.

The amp is an all-tube cathode-biased amp, with 2 6L6's for the output (tube rectified and 2 12AX7's in the preamp). There are 2 output jacks, one for 4 Ohms and one for 8 Ohms.

The amp is pretty loud, and I was told that I could safely swap the 6L6's for 6V6's, since the amp is cathode-biased. I was also told that the impedance values for the outputs would double if I switched tubes, i.e. the 4 and 8 Ohm outputs would become 8 and 16 Ohm outputs respectively.

Is this true? And since the amp was designed around 6L6's, will the current or whatever be too high for 6V6's and shorten tube life or amp life?

:confused-smiley-010 Thanks!
 

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Discussion Starter · #3 ·
Thanks very much for your response, Wild Bill. Your depth of knowledge in this field never ceases to impress me!

You're quite right, there IS quite a lot of information missing, and unfortunately it's because the amp is a hand-built affair by a really nice guy who happens to be on vacation right now, thus my inablility to go directly to the source for answers!

I had no idea that my question involved so many variables, which goes to show how ignorant I am about all things electric :rolleyes:

I'll bide my time and wait for the builder to get back from summer vacation, because I feel I definitely WILL injure myself if I start to try measuring plate voltages...
 
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