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Vintage Asylum Classic gear from yesteryear; vintage audio standing the test of time. |
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In Reply to: kt88's to replace the EL 34's in a eico hf-60 design posted by rcb on May 12, 2007 at 07:43:28:
I posted quite a bit on this and core is correct as far as the driver circuit but you need to change the bias resistor to a 10k instead of the 22k in the bias circuit and you can also put in a 25k pot instead of the 10k and this will give you enough range to go from el34 to 6550s..I also changed the 3k resistors in the feedback loop to 1.5k because there was a tiny bit of distortion and this appeared to clear it up when I swept the amp..Also you will love kt66s in this amp..Its so nice when you get the right 6550 or 6L6 product in this amp and when I mention the 6550 and 6L6 I mean those tubes and all of their relatives and ancestors.
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Follow Ups
- Yes you have to change the neg bias resistors - Michael Samra 09:54:42 05/12/07 (4)
- looking for the 22k neg bias resistors - rcb 13:27:39 05/12/07 (1)
- Re: looking for the 22k neg bias resistors - Michael Samra 08:27:09 05/13/07 (0)
- Re: Yes you have to change the neg bias resistors - Michael Samra 09:56:42 05/12/07 (1)
- eico hf-60 maual - rcb 07:56:33 05/15/07 (0)
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