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In Reply to: 45's in AES SE-1... what's a PP amp doing with the label SE-1? nt posted by Kurt Strain on May 12, 2002 at 23:03:48:
Follow Ups:
Right. Whoops :)I suppose it's possible it could be biased for 90ma/channel (it does take 300B's). But since he was talking about 45's, I just assumed it was for both, since while 45ma is a little crazy, 90ma is... certain death.
Charlie
...through the cathode resistor, one resistor for both channels. It's cheaper to do it that way and it's okay since a big cathode bypass capacitor keeps both cathodes at AC ground simultaneously, so no significant crosstalk. It's just not very commonly done.Kurt
well you have never seen one of my amps have you???i owe 'ol mr. 1626 himself bob danialak for this tip... well worth the clip lead for an experiment.
btw a pair of series AA nimh cells does wonders to a stereo pair of 6C45's
dave
What a stupid idea!Solder the leads to the battery for best results ;)
-j
... as I'm headed into DIY territory. :)Do you mean both tubes sharing a single (well, 2 in series) battery for bias? My other thought was those small(ish) D-cell Lead Acid batteries. 2.15-2.2v, once charged. What op point would that be then? I've heard quite a range, even up to 200v, 45ma.
I was thinking about some 6C45 spud amps. Most expensive thing in the amp will be the OPT's. Might start off with some 5k PP OPT's (it'll be parafeed) until I can save up for Mikey's 5K nickels.
Charlie
well you have never seen one of my amps have you???i owe 'ol mr. 1626 himself bob danialak for this tip... well worth the clip lead for an experiment.
btw a pair of AA nimh cells does wonders to a stereo pair of 6C45's
dave
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