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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: RE: 12AY7 =gain of 40, 12AX7=gain of 100 posted by Dingojazz on June 7, 2015 at 10:25:29:
They are different tubes. The Dynaco boards were designed to work with a 12AX7 and it's active feedback RIAA compensation needs all the gain to work the EQ task which is quite a mountain to climb. You should follow the recommendations that dynaco issued for B+ voltage. Maybe you have a power supply problem. Many of these early 12ax7 feedback circuits ran them low PLATE current, around 1MA, which starved the tube. Generally if you change one thing you have to wind up changing many other things to compensate.
"...the fool doth think he is wise but the wise man knows himself to be nothing but a fool." Will Shakespeare
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Follow Ups
- RE: 12AY7 =gain of 40, 12AX7=gain of 100 - mobiasloop 10:38:30 06/07/15 (1)
- RE: 12AY7 =gain of 40, 12AX7=gain of 100 - Lew 10:05:20 06/08/15 (0)
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