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In Reply to: RE: New installation of my A-S OTL amps posted by jeffreybehr on June 14, 2019 at 20:36:30
...which varies by amp, is NOT where the gain-reduction shorting plug goes, it goes in V2, the cascade 'top'.(V3 is the CCS in amps that use one*, and the cathode folower is V4.)
Yes? No?
But you're probably correct about not getting full power while using the plug unless one has LOTS of Voltage with which to drive the amp.
* In versions 3.3, what was V3 turns into V1c, that is, one of the paralleled triodes that create initial Voltage gain.. Here's a pic of my M60/3.3 three years ago.
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Tin-eared audiofool, lover of large-scale Classical and film music and movies, and amateur fotografer.
William Bruce Cameron: "...not everything that can be counted counts, and not everything that counts can be counted."
Edits: 07/08/19Follow Ups:
If you decide the MA-1 meet your needs, and decide to sell your M60 Mk3.3, please let me know. I'm in the market.
V2 in my M60s
...about where the shorting plug goes to reduce power, now that you mention it. I don't think using them requires any change in fuse value though. To clarify, I only commented about acres verde's shorting plugs since it speaks to reducing power, but doesn't require a fuse change as running fewer tubes does.
I may be worth it to verify with Ralph that the protocol for my particular MA-1s is the same as yours, since mine are considerably older.
Have fun with your experiments!
marc g. - audiophile by day, music lover by night
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