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Old 27th February 2011, 07:44 PM   #3241
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These two amps are certainly different looking. That's what I like to see. As long as they sound good too.
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Old 27th February 2011, 08:34 PM   #3242
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Here is my prototype for a balanced audio preamp, one channel shown here, the reason for me to build this way is that the chassis used is only 35mm high and not much space so the module is only 30x65x80mm

I use a E88CC at 60V with 2SK170 for CCS
Supply is 12VAC pumped up to 60V and regulated with SS9012/SS9013.

Click the image to open in full size.
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Old 27th February 2011, 08:40 PM   #3243
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Nice, is it based on Elektor schematic?
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Old 27th February 2011, 10:48 PM   #3244
pebmrb is offline pebmrb  United States
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Thanks to all for the responses to the Eyepod.It may look menacing but sounds heavenly driving my Dallas II design back loaded horns.I am currently building a CD player to match the Eyepod design.It's based on the Sony Playstation 1.I'll post pics when it's done.
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Old 1st March 2011, 06:42 PM   #3245
Reegal is offline Reegal  Italy
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I would like to present my last project, s.e. amplifier with vt-127A triode working in class A1.
Driver 12B4A, input stage 12AT7
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Old 1st March 2011, 07:09 PM   #3246
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Quote:
Originally Posted by Reegal View Post
I would like to present my last project, s.e. amplifier with vt-127A triode working in class A1.
Driver 12B4A, input stage 12AT7
Hey! that´s a nice amp yové built there. Cool using obscure vt-127A tubes too. What are you using for signal/driver tubes? Care to share the schematic, Ivé got itchy fingers and Im looking for a new projecy, this would suit me just fine :-)

Congrats
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Old 1st March 2011, 09:24 PM   #3247
Knarf is offline Knarf  Denmark
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Quote:
Originally Posted by Reegal View Post
I would like to present my last project, s.e. amplifier with vt-127A triode working in class A1.
Driver 12B4A, input stage 12AT7
Looks nice.

However I'd suggest you crank up the bias and get those anodes glowing. The gettering in these tubes is the gray Zirkonium 'powder coat' on the anodes, and they need to be red hot for it to work. You risk that the tubes might not last long if you run them cool. Quite the opposite of ordinary audio tubes.

Cherry red to a dark orange will do. No need to worry, they can take it.

- Frank.
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Old 2nd March 2011, 06:46 AM   #3248
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Quote:
Originally Posted by Knarf View Post
Looks nice.

However I'd suggest you crank up the bias and get those anodes glowing. The gettering in these tubes is the gray Zirkonium 'powder coat' on the anodes, and they need to be red hot for it to work. You risk that the tubes might not last long if you run them cool. Quite the opposite of ordinary audio tubes.

Cherry red to a dark orange will do. No need to worry, they can take it.
When I was a kid my mom used to fire up a kerosine lamp during power outages. It was nice and warm..
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Old 2nd March 2011, 09:14 AM   #3249
Knarf is offline Knarf  Denmark
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Originally Posted by Wavebourn View Post
When I was a kid my mom used to fire up a kerosine lamp during power outages. It was nice and warm..
When I was a teenager my mentors used to fire harsh words at me for ignoring Eimac's recommended operating practices for power tubes...
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Old 2nd March 2011, 10:14 AM   #3250
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I've run a number of Eimac tubes for years without ever achieving cherry plates.

Jim
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