2. amps-preamps
  3. 1299280867

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
almarg's avatar
almarg
9,670 posts
 
Thanks for sharing.

Did you provide some sort of low impedance load at the output (e.g., 8 or 16 ohms), to prevent the possibility of damage to the output transformer and/or output tube from inductive kickback in the transformer?

Best regards,
-- Al
vett93
205 posts
 
Can you share with us how you converted a SET amp into a preamp? I have a 300B SET amp and want to do the same thing.

Thanks.
jayb77 OP
46 posts
 
To Almarg...Yes I used an old Carver wide band coupler which has prebuilt transformer and resistor step down from high gain to low gain for interconnects. I dont beleive you can find one as nice as this one prebuilt. I bought this one in the early 80,s. If you are like me you are a DIY,er and using Ohm,s Law.
More to discover