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6V6 line preamp
6V6 line preamp
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Old 24th December 2011, 05:53 PM   #211
SGregory is offline SGregory  United States
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Both will work. The blue washers are actually isolation grommets made for the purpose. Pretty cheap from grainger. The tubes are pretty well isolated. Have to hit the chassis pretty hard to get it to sound through the speakers.
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Old 24th December 2011, 06:37 PM   #212
Salas is offline Salas  Greece
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6V6 line preamp
What 6V6 make are those in your pictures? Would be more microphonic if you had gain.
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Old 24th December 2011, 06:58 PM   #213
SGregory is offline SGregory  United States
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Zenith lable. Not sure who manufactured it though.
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Old 24th December 2011, 07:04 PM   #214
Cassiel is offline Cassiel  Libya
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Sgregory I like your chassis (knobs too).

Salas isn't leaking any info out on the sub chassis. Top secret?
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Old 24th December 2011, 07:07 PM   #215
Salas is offline Salas  Greece
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Quote:
Originally Posted by SGregory View Post
Zenith lable. Not sure who manufactured it though.
Good ones. They might be Sylvania.
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Old 24th December 2011, 07:10 PM   #216
Salas is offline Salas  Greece
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6V6 line preamp
Quote:
Originally Posted by Cassiel View Post
Sgregory I like your chassis (knobs too).

Salas isn't leaking any info out on the sub chassis. Top secret?
What secret? From early in the thread I recommend some form of isolation. The less microphonic on steady chassis with the gain circuit was the new Tungsol from those I checked. In CF things are easier, and Scott's combination of CF and grommets won't create trouble with any make, even the most sensitive ST bottle ones.
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Old 24th December 2011, 08:40 PM   #217
merlin el mago is offline merlin el mago
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I have nylon spacers and screws, can I use this black rubber ring (it's M3)?
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Last edited by merlin el mago; 24th December 2011 at 08:43 PM.
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Old 24th December 2011, 09:54 PM   #218
RCruz is offline RCruz  Switzerland
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6V6 line preamp
They look very small and stiff.... try to get some soft rubber (like the one used in the SME3009 base plate fixing screw orings)... very soft.
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Old 24th December 2011, 10:01 PM   #219
tinitus is offline tinitus  Europe
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6V6 line preamp
rubber grommets

mount tubes in a just big enough alu or copper plate
use rubber grommets in its chassis mounting holes
and in your main chassis, use grommets as well

mount a small piece of soft neoprene between plates, on mounting screw
use selflocking nut

mount your trafos with anti vibration rubbers too

screws should be very carefully 'adjusted'
it really makes a big difference on how much buzzing is transferred to the chassis
with a simple wooden stick(or stetoscope) you can easily hear how much
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Old 25th December 2011, 10:21 AM   #220
merlin el mago is offline merlin el mago
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Could you post a pic & where can I buy?
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