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In Reply to: RE: Peerless /Heathkit w5M output transformers- What gives? posted by wpod on September 04, 2014 at 17:33:22
Absolutely the 16309 is the better sounding transformer mainly because of the nickel core but it is also a 1khz higher impedance than the 16458.
The biggest reason for failure of the 309 transformers was simply because people didn't change the original leaky coupling caps and balance the KT66 tubes in the amp. When the coupling caps became leaky,they would put DC voltage on the control grids causing the output tubes to draw excessive grid current that went beyond the 25 watt rating of the output transformer.This caused it to open up on the outer winding to center tap.
Honest amplification is better than excessive 2nd order distortion anytime.
Follow Ups:
Over years of experiments using pentodes or tetrodes, the amplifiers sounded better by increasing the tube manufactures recommended plate to plate impedance. Manufactures figures were focused on maximum power output. The amplifier dampening factor also goes up with higher plate plate to plate impedance.
Absolutely! That is why I mentioned it and you do lose power with higher than typical impedance for a particular set of output tubes but you almost always gain in bandwidth and lower distortion.
Honest amplification is better than excessive 2nd order distortion anytime.
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