Heyboer

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Posted by manualblock [ 24.45.24.101 ] on August 09, 2006 at 12:41:44:

They are winding OPTs for the Eico HF 87/89 series of amps. Very high quality units. DIYTube has a PC board that can use those. It is a duplicate of the Mullard 5-20 amp circuit with a couple minor changes.
Very good sounding PP amps.


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