Pars

On the CFP3 that I worked on for purk, built by Dukei/Miroslav I believe, the GRLVs were using A1943/C5200 IIRC and seemed to work just fine.

Happy Birthday Marc!

Our cat sometimes sleeps inside the bass drum of my son's drum set, crawling in thru the port on the front head. Helps that he has a small pillow inside as well.

Happy Birthday!!

The thread on diyaudio might be of interest to you re: OPA828 vs. OPA627. Schitt equipment seems to be well engineered and built, to very attractive price points. Unlike some others in heavy shilling/pimping these days 9<<cough>> Topping <<cough>> https://www.diyaudio.com/community/threads/opa828-opa2828-vs-opa627.400109/

I've never built a T2, so take this with a grain of salt, but anytime I see DC levels bouncing all over the place, one of the first things I would suspect is oscillation somewhere.

Will the 5V LT1021 work in shunt mode? I didn't think it did? Kerry posted a design using a MAX6138 reference which would do 5V back in 2018:

That sounds reasonable in terms of the pots and their action. I couldn't comment on voltage before clipping, but I guess around 2.5Vac for a front end sounds reasonable. Kevin could probably tell you, or maybe the guy building the CFP3s on head-fi (sorry, forgot his name). Glad you found the problem with the opamp socket. That is a strange one.

Are you asking about the bias for the ubal-bal tube stage or overall for the CFP2/CFP3? For the CFP2/3, it is generally 150mA, which is also what I run my DynaFET at. Not sure for the tube stage, sorry.

Happy Birthday Wayne!

RIP and Happy Birthday!

Happy Birthday Jim! I hope you have a great one!

Happy Birthday!!

Happy Birthday John!

16.98V is about what you would get if you had R7 and R8 swapped. Check the positions on the board.

RIP to your friend Jimmy, Brent.

Happy Birthday!

I would think cfp2hmt as the latest one.

Just started watching this last night (s1e1). Enjoyed it, and will continue.

Interesting. Where is a good source for forming taps?

Happy Birthday and miss you Matt! RIP

The standard audio grade from Toroidy is the same transformer; just not encapsulated. It is screened, etc. just like the supreme, and at least for mine, was half the cost. Mine only took about 4 weeks from order to delivery. I might consider the 100Vac transformer. You might need to deal with some extra heat, and ensure that component ratings are sufficient for that.

I would check with Toroidy in Poland. I had a pair of 6 secondary 100VA transformers done and they were pretty reasonable. Dual primary, 4x24V and 2x8V for either 57 EUR for their standard audio grade or 107 EUR for the audio supreme grade (I went with the audio supreme). They could do your 90Vac and 8Vac with no problems. Shipping was a bit high as is to be expected, but they came in about the same delivered as SumR, who I wouldn't use now.

I would guess that those are for turning on the opto coupler ( CPC1117NTR), same as the normal GRHV's have, for delay purposes. Haven't looked at the schematic for the 100, but for the normal GRHV, you have to apply a voltage to turn it on. You can leave the CPC1117 out if you don't need this feature. I probably wouldn't use mica insulators for something like this (aluminum oxide instead), but I know mica has been used throughout the years for HV applications.

What?!!! No more BD?