Quote:
Originally Posted by Isaacc7
A while ago I had asked about modifying my amp so that I could use 12v tubes on the input. Got some helpful responses but in the end I decided against modding the amp. There was just too much chance of really screwing it up. I found someone on Head-Fi that had the answer. It's an external power supply just for tube heaters and a custom adapter.
Here's what it looks like in action. Using a 14n7.
This is a variable supply. I spent a little extra on that instead of a dedicated 12.6v supply in case I wanted to try some 4v tubes in the future. The adjustment knob is really touchy. 12.5 is as close as I've been able to get without overshooting. It's close enough. He originally designed it so that folks could use gu50 tubes. It cost me a little over $100, would be less if I just got the 12.6 version. If I had thought about it I probably could have arranged it so that the wire would be routed towards the back of the amp instead of the front. Oh well.
Now I can use all of my fancy 12sn7 tubes like the coveted Tungsol round plate with black glass and even 12v only versions like the 12sx7 and the 2c50. This lowly 14n7 with angled plates sounds awfully good. Think I'll let that ride for a while.
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Hi Isaacc7
in principle, I find the idea of using 12 V tubes interesting and the implementation with the additional device good.
There are certainly many great ways to find your personal sound with the tubes.
For me personally, the variable supplay would be too uncertain. with a mismatch to cause damage to the tubes or amplifier.
Do you have experience with the SRS551, F3a ; RS1003 tube?
One Uf 6.3 Volt / If 2.1 Ampere Pentode