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Need an audio brainiac...Stumped...

I just scratch built a "dynaclone" ST35 6BQ5 power amp from the schematic and stayed true to the dyna design save i used a 5u4 tube HV rectifier vice the diode dyna design.

The amp sounds fine on 3 different sets of speakers (Infinitys, Magnavox/Jensen alnicos, Realistic Nova 10's) but motorboats/farts when hooked up to my newly aquired Altec alnico Santanas. 2 other tube amps and 2 other solid state amps work fine on the Sanatnas.

This happens only with that one amp and speaker combination (Dynaclone and Altec Santanas)
trichifi
cerrot's avatar
cerrot
1,700 posts
 
how about bad caps in the altec crossover?
trichifi OP
3 posts
 
I replaced the xover caps and whats wierd is that 4 other amps work great with the Altecs and the dynaclone works great with any other speakers save those Altecs.. Got a set of Valencias in storage id like to pull and see how they behave since the voice coil/mag structure is the same betwenn the Santanas and Valencias. Mybe it is some inductive quality that only is present in Altec drivers..Thanks for the thought - best regards
ptmconsulting
1,000 posts
 
Strange lack of synergy? It's got to be the output transformers reaking havock when paired with those crossovers. Impedance issues perhaps?
cerrot's avatar
cerrot
1,700 posts
 
inductance or impedence...wow.
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