SET pre-amplification?


I recently took an old 6b4g SET amp and converted it into a preamp. WOW!...I never have been so close! I get 90% of that SET sound but with the benefit of a higher power tube or SS amp at the end of the chain. I am still playing with this and I have found the only draw back is hum. It is 60 Htz which is normal heater hum so possibly the filaments should be DC heated not AC. Just sharing so you to can experiment. Good luck!
jayb77
I can help you with this if you want to try this. A 300B would sound great! The 6b4g is an octal 2A3 so lots of great midrange. I would try using resistors from Mills. You can buy these on line at parts express.BUT I would try to find a device like my Carver coupler. I know car audio stores have high to low adapters for car radios to turn the power out channels in to low level RCA signal levels for amps and being most SET amps are less than 25 watts this shouldnt be a problem. The Carver coupler I am using is the same thing just made specifically for home audio. That should work. If you still have issues I will get exact specs for your amp and help you build one just for it. Let me know if I can help further. Jay
I will part with my Carver coupler for trade or money if anyone is interested. I will post pix of the coupler in my system in tweaks. I think I could build my own in fact I know I can so I am willing to acceppt any reasonable offer.
Not all preamps are single ended and even the ones that are dont use 2a3 or 300B,s for the signal. Well I am sure that this already exist however I couldnt afford it so thus this Idea.
OK, I was under the impression that most were (based upon a certain manufacturer using this as a major selling point, when is was NOT per many... posting to the contrary).

Seen posts of people using (SET) headphone amps as preamps, but I only remember an early Musical Fidelity model off the top of my head, used in this nature.

Old production 6b4g's are no longer inexpensive, but I'm certain you are already aware of this.