jose

My amp module is ready. Now I'm working on a second Psu for the amp (dual-mono) and at the same time I work on the unbal/bal preamp (I have the PSU ready). I want to do a three module system.

sorry, 30Volt Edit : I´m using 6CA7

My BH starts with 30mVolt 30 volt and needs 15~30 minutes warm up. After, offset is arround 5 ~ -5mVolt.

If in the GG the servos work perfectly, in the BH it should work. However I think that the nature of the beast is that ... don´t use servos

I'm listening my system; Dac, Classé preamp, CFA/bal and the LCD2. All system on Bal connection. Guys, this is just brutal. Thanks Dr. Gilmore !! I consider that the Dynahi has a more "musical" sound and the CFA/bal has a flatter and more precise sound being a beast in terms of power. Now I am considering whether to do my unbal/bal or to use the CFA directly using the preamp outputs of my Classé.

You don´t know the power of the dark side!

You need a Megatron... [emoji16][emoji16]

Happy Birthday !!!

In your case, I would feel more comfortable using the amp at the minimum and without letting the valves get too hot.

Thanks Birgir, for ruling out a little Is there any way to eliminate that static? In principle I don´t notice any kind of distortion or noise once I equal the balance from my DAC between both channels. There is a difference of about 22dB

Other BH working !! I think that 5,5Vac is low. 6Vac can be right. You can try with three 1R in parallel (about 0.33R)

Guys, I need advice. Yesterday I got a SR507, physically they are in very good condition, they have a box and the correct documentation although they are used. When I connected them, the right channel is almost not heard. I have read that it is a recurring problem in some models but I don´t know if it has a solution or why it should be. What I can do? Do I return them to the seller? I'm a bit frustrated

I´m very happy with my SR202. I think that they are equilibrate than my SR307.

I used aluminum oxide pad for all. I don´t know if it´s necessary but I feel more secure.

I run my BH at 20mA and it run HOT, very HOT, so uses a nice heatsink

I have always thought that the SRX-P "marries" especially well with my Lambda Pro and I like to use this combination with soft or relaxed music, voices, etc... I think they make a perfect combination.

yes... for this reason I buy them in multiples of 100

I found the answer to my question on GG thread because I had 1/2w resistor and then I changed to 2w for this: If you use my BOM, that would be 10k/.5w as you used. A experienced builder told me grid resistors were super hot because it was connected to the internal structure of tube. I later changed to 470R/3w, just because I have them in stock. KG said the value doesn't really matter. T2 used 20k. BH used 470R. Now, what else? if 1/4w is fine...

I have not checked the temperature of this resistance, but in the BH and the GG I used that reference without problems. *When I was referring to using a higher value, I meant a value greater than 470R.

Use 71-CCF02470RJKE36 but really if you want, you can use a superior value. For two channels (2 pcb´s) you need 4 trimp.

If nothing says otherwise, I will try to match as closed as possible P to P and N to N.

Thanks Pars. On our boards we haven´t any reference. I guess that we can use the OP27 on the buffer too.

In buffer and Un/bal board?

What OPA is recommended?

Black Sabbath