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08-16-2019, 05:29 PM
Hi Kevin, thank you for your reply! Yeah I have all the TUT series as well as the speaker book and TOT...love them all.
Ok, saving a component is a better solution than mine! Plus adding that resistor back that opens up an easy way to do mixed bias, huh?
On the coil I used a diode snubber, but I can easily try the zener...I believe I have some 33V. I assume since we are looking at the coil that it means that reduced speed of the contact could be the issue? It's pretty weird when it happens, you can hear the relay click but its far weaker than normal.
So for Rk, how do we determine what average is? What I tried to do was bring the amp to max clean power with a sine, then measured the voltage across Rk. In this case it was 70V and the resistor was 470 Ohm, which calculated as 10.5W. But this is where it gets foggy for me. Plus, that sucker got hot fast, which scared me a little.
That's really smart why you use the higher value for Rk. If one tube died, I'd imagine the other would shortly follow. I can't speak to the merits of warmer bias yet, so higher values are fine with me, lol.
Ok, saving a component is a better solution than mine! Plus adding that resistor back that opens up an easy way to do mixed bias, huh?
On the coil I used a diode snubber, but I can easily try the zener...I believe I have some 33V. I assume since we are looking at the coil that it means that reduced speed of the contact could be the issue? It's pretty weird when it happens, you can hear the relay click but its far weaker than normal.
So for Rk, how do we determine what average is? What I tried to do was bring the amp to max clean power with a sine, then measured the voltage across Rk. In this case it was 70V and the resistor was 470 Ohm, which calculated as 10.5W. But this is where it gets foggy for me. Plus, that sucker got hot fast, which scared me a little.
That's really smart why you use the higher value for Rk. If one tube died, I'd imagine the other would shortly follow. I can't speak to the merits of warmer bias yet, so higher values are fine with me, lol.
