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OTL, Output Transformerless Amplifier User Group.

Oh my...I suppose replacing V3 with a better tube will improve the sound, but I sure wouldn't...

...use any kind of socket extenders, just find a pair of standard-size RCA or Ken-Rad VT-231s (or TSRPS!) for that position.

Where (rotationally) are you running your preamp's volume control? If it's sort of low and you're 'throwing away' 10 or 20dB of the preamp's Voltage gain, do as I did and buy a pair of Ralph's tube-replacement plugs and replace Vs3 and turn your volume control up 10dB.
 photo 2016Jun08_RC amp_2000w_zps9s1hjral.jpg
Tin-eared audiofool, large-scale-Classical music lover, and damned-amateur fotografer.
William Bruce Cameron: "...not everything that can be counted counts, and not everything that counts can be counted."

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