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OTL Asylum OTL, Output Transformerless Amplifier User Group. |
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In Reply to: some Mk3.3 changes posted by Ralph on April 19, 2016 at 09:35:51:
Straight from the Ralph's mouth, about the M-60 Mk.3.3:
1. The old 'input tube', V1, is now two input tubes in parallel, labeled V1a and V1b. V1a is in the right-rear position (see picture) while V1b is at the left-rear. These two input tubes are physically separated by the...
2. Old and new V2 which I can never remember what to call this function--it's the Voltage-gain 'top' tube in the Mk.3.1 schematic I have. This is the rear-center tube and is the one that would be replaced with the gain-reduction plugs that A-S sells.
3. The good-old V4 cathode follower is in the front of the amp.All of these in my amps are currently Tung-Sol roundplate 6SN7GTs. Those in the CF positions are my least-good tubes, low in transconductance and relatively high in microfonics--that in these CF positions are free of microfonic noise when tapped lightly with a pencil.
FWIW, even with only dozens of hours on new amps, new tubes, new Teflon-film coupling caps, etc., these amps have helped my system sound even better, particularly in transparency and spatial resolution. I'm very happy.
Edits: 04/20/16
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Follow Ups
- Ralph, TYVM. 'Twas a pleasure talking with you today. More on tube positions. - jeffreybehr 16:52:14 04/19/16 (0)
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