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RE: Replacement for EH6922

51.6.104.239

In Reply to: RE: Replacement for EH6922 posted by Alex M on February 14, 2024 at 11:56:23

Thanks for the suggestions. I now have a batch of JJs on order from Langrex.

Alex

Follow Ups:

RE: Replacement for EH6922 - Sondek 20:04:38 02/21/24 (1)
Plz circle back and let us know how they work out for you.
- RE: Replacement for EH6922 - Alex M 02:04:12 02/22/24 (0)
  They arrived yesterday - great service from Langrex!
  
  My immediate thoughts after the preamp had been on for three hours with the new set of valves in was how often we accept something performing under-par for a long while. All of a sudden the hiss was gone, as was the rushing noise in the right hand channel. So it's hard for me to evaluate the differences between brands! I can definitely hear deeper into the soundstage, but that's probably the absence of the noise that was veiling everything before.
  
  Actually I suspect that the RTP3 is less sensitive by design to tube rolling than many other circuits, since the voltage amplifier stage is a cascode and the Super Linear Cathode Follower output stage has both a CCS on the cathode and a bootstrap on the anode of the CF to ensure constant voltage operation. And the phono stage is a hybrid cascode LTP, whose gain depends almost entirely on the passive components around it.
  
  Alex

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