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Old 28th January 2004, 07:48 PM   #11
lpd is offline lpd  Canada
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I'm not sure what the b+ in the KT88 monoblocks is, but I'm assuming its about 450-475 margin. I'll pull out the vm tonight and check the voltages.
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Old 28th January 2004, 09:05 PM   #12
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Location: Alps:Tube amp designs over 150W, SMPS guru.
Okay at the bench- with my switchable B+ homemade amp. I'm running at 485V B+ using parallel P-P UL 2,25K A-A with 6550B's, just squeezing 135W per ch. Tubes reasonably well matched give excellent AB1 performance. I find 6550's give lowest THD at app 65mA/quies/ tube.
Another interesting situation occurs at reduced B+ of 250V using same circuit but 95mA quies /tube. At reduced Pout of 25W, Anode current =100mA per tube n'st damm it class A.
THD in both power cases well below 0.1% at 1dB below clip with 20dB fb..

enclosed excel graph..I hope this comes through.....my machine isn't the best to use..for attachments....


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