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In Reply to: RE: Here's the distinction posted by E-Stat on June 02, 2016 at 15:20:21
Abe is correct. I looked at the schematic, and as you would expect the output stage is a cathode follower.
Cathode followers (a.k.a. "buffers") have a voltage gain of less than 1. In other words - no gain, in fact they attenuate the signal slightly. But they do have a much lower output impedance which is useful for a preamp.
So listen to what Abe is saying - he's got it right.
Follow Ups:
I sit corrected.How did the original version use its 6922 tubes vs the 6H30s of the MKII? Schematics on the original are easy to find, but I have not been able to find one on the MKII version. Where did you locate that?
Were two of them for gain and the other two used as cathode followers?
I seem to recall that Victor Khomenko used to say that one 6H30 could replace two 6922s hence the moniker "super tube".
edit: Abe - I got the text of your deleted post. I have found myself mistaken a number of times, especially when empirical data was unavailable. Search for "mistaken" and "corrected" and you will find numerous hits where it applied to me. You were right. I have no trouble admitting that I am wrong (now and again) :)
Edits: 06/02/16 06/02/16 06/02/16
...it's not like I've never been wrong.
The schematic is on the ARCDB site (link below). Scroll down that page and the Mk II schema is there.
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Interesting. It looks like the LS25 is "all tubes" except for a FET that appears to be a constant current source and the other two I'm not sure. For biasing?
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