Ike with 5881's

a DIY, modified Mullard 5-20 monoblock design

Ike with 5881's

Postby battradio » Fri Jul 27, 2012 10:53 am

I have a pair of Eico HF 20 output transformer which are 20 watt and about 6.6k so i was thinking that 5881's would be a good choice . I also have the original power transformers from the HF 20's so B+ should be just about right . R30 the 200K will have to be adusted and maybe the cathode resistors .

Are any other changes needed to eclone boards
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Postby Shannon Parks » Sat Jul 28, 2012 5:01 am

Nope - those HF20 trannies are a perfect fit. No surprise as it is an Eico-clone. (lol)

I think other than your cathode bias resistors, just keep an eye on the phase when you hook up your outputs. I think that will require the "tap the feedback circuit closed momentarily" method. New outputs get hooked up inverted all the time - more than the law of averages would leave one to believe.

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