previous: tboy q{..if you remove one tube for half... -- 7/20/1999 0:19 AM

Re: Voltage measurements on 2 6V6 parallel CHAMP...

7/20/1999 1:02 AM

MBSetzer

Re: Voltage measurements on 2 6V6 parallel CHAMP... Woops -         Thanks for the reminder tboy!         It's hard to think of all the implications sometimes. I have gotten accustomed to using separate cathode resistors on parallel tubes for just this purpose!         On a cathode biased parallel single-end amplifier, if you have individual cathode resistors for each tube, THEN the only adjustment necessary when you remove one tube is to make sure to also double the speaker ohm load or change it to another appropriate tap to maintain proper impedance matching.         In most circuits having a shared cathode resistor (series or parallel tubes), you would have to double the value of that shared resistor to find the correct value of individual resistors for each cathode which would result in the same bias level.         Glad you noticed this before somebody put too much stress on a good 6V6, we know they're not making those like they used to . . .         Thanks & Best Regards,     Mike