TU-870R, measured

VK Music - Elekit & Triode Japan Forum

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I'm still new to using my oscilloscope as an audiophile tool, but for what it's worth, here's the results of my passing square waves through the TU-870R. I didn't have an 8 ohm load resistor handy, so I used the closest thing handy, which was 10 ohms.

at 1 khz:

and at 10 khz:

If I'm interpreting this correctly, there's a bit of ultrasonic ringing going on, which ought to be easy enough to tame by putting a small capacitor parallel to feedback resistors R12 and R14. I'd also like to see what affect altering the value of those resistors will have.

Impression to date is that the amp is pretty well designed and very listenable as-is, but I can't resist seeing if I can improve it by touching just this one part of the circuit.

Edits: 60/41/01 60/42/01 60/81/01 60/41/01 60/42/01 60/42/01 60/42/01 60/42/01 60/42/01 60/81/01 60/42/01 60/42/01

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Parts Connexion

Topic - TU-870R, measured - 4season 23:38:18 08/03/09 (2)

RE: TU-870R, measured - vkung 11:41:25 08/04/09 (1)

RE: TU-870R, measured - 4season 20:10:35 08/04/09 (0)

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