For the last year or so, I’ve been using Amperex tubes outperforming the valves – to my ears. Share This Page Tweet. The seller won’t accept returns for this item. From cartridge to speaker, the signal in my system passes 7 valves, four coupling caps, three transformers, three interconnects, numerous wires, etc. Alu sheets shaping up.

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Primer spray; quite pricy this one, but good. So, time to reconsider the whole project. Question is what operating point shall i run at? No need to say more but this: I never do high-gloss painting as I do not have the facilities to do so.

Universal PCB for tube pre SRPP/CCDA ECC88 ECC82 from stereo24 on Tindie

I’m not a fan of having the lower shelves filled with power supplies, but the line stage is so good, I’ll tolerate almost anything. Next all tubes are heated by AC and I think this is one reason for serious hum problems. Direkt drive the UCD.


Makes implementation very easy. Cabinet dimensions will be D x W x 75 H mm.

Have tried adding caps right on tube pins – didn’t help. Do you already have an account?

One thing I can say: Some good advice on hum problems can be found here at: If your system needs gain: It sounds very good. So, with the capacitor removed and a 1.

Removing the choke also from the inside to the top behind the mains transformer helped somewhat further and if I ran my Audio Mirror amps at 1 volt sensitivity currently at mVI’d probably be where hum level is acceptable. 66n6p the output overcomes much of the mismatching problems. Headphone Reviews and Discussion – Head-Fi.

This reduced hum considerably and one channel was silent. They were between the opampinputbuffer and the UCD powerstage. OT load is increased to 1.


Jan 13, at 8: In the final edition, the filament supply for the tubes will be changed to a regulated Two new mains trafos have been ordered with 14 volts outputs for regulated filament supply for the tubes. Expect to see a few e-mails and new articles on this circuit.


Select a valid country. Trying true start earthing of all ground connections 66p help either. Post 1 of 6.

6n6p operating point?

The item may be missing its original packaging, or the original packaging has been opened or is no longer sealed. Not the problem here. Finally, the line stage, version 2 is playing and measuring the noise level on the CLIO looks satisfying. I would look at SRPP.

Attenuator seen from rear. Learn more – opens in a new window or tab. International postage paid to Pitney Bowes Inc.