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I have vintage Pioneer SX-1250 receiver that sounds great on its own, but I was also was thinking of using it’s pre-amp outputs to drive a tube amplifier – an integrated amp with it’s own volume control and two signal imputs.
The amp is a Mexing/Mingda MC-34B push-pull. I have two options to drive it; 1) using one of the 1250’s tape outs, or 2) using the 1250’s pre-amp out.
The advantage of #1 is that output level is set, and I can use the MC-34B’s volume knob to control the output.
The advantage of #2 is that I get the use of the 4 tone controls (50Hz, 100Hz, 10kHz, 20kHz) of the 1250 which I really like - yeah I know audiophiles are supposed to listen to the music “flat” but…
With option 2, the question is, where should I set the volume controls of the 1250 and amp? It seems that the most logical thing to do would be to adjust the volume control of the 1250 to a certain average voltage output, leave it there, then use the volume control on the tube amp to set the output. If this is the way to go, what should the 1250 output voltage be, and what kind of signal should I use to determine it. I have a scope that I can use to measure.
Or is this whole idea just crazy.
...set the 1st control at a 'high' level, say around 3 o'clock, and with the 2nd control full DOWN, start playing music. Then adjust the 2nd control up to get to a level as high as you'd ever want.
This minimizes the amplification of the line-level's constant noise and gets the preamp's volume control up where it tracks more accurately between channels.
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