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Old 4th July 2007, 09:20 PM   #11
diyAudio Member
Join Date: May 2003
Location: Prescott AZ
I actually built this schematic on the HF20 chassis. Power transformer runs a bit hot, but has not failed. Using KT90's.
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Old 4th July 2007, 09:28 PM   #12
pchw is offline pchw  United States
diyAudio Member
Join Date: Apr 2006
Location: Fremont, California
Hi MG,

Did you use the original Eico PT's? If so, did you use separate heater trafo? I was told that they were not even good for EL34 when I planned to build an Eico HF-35 out of them.
- Fred -
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Old 5th July 2007, 09:16 AM   #13
diyAudio Member
Join Date: May 2003
Location: Prescott AZ
I used all the original iron, without an additional heater supply. Everything is new but the iron, including a Hammond 159P choke in the PS. PT runs quite hot to the touch. I'm probably pushing it, but it has held together. With a GZ34, the B+ runsa bout 4230V.
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