I purchased these 10K impedance OPT's to get a Wyetech 572-10 amp back up and running. One of the original 10K Audio Note OPT's was bad. I installed the Hammond's and was greatly enjoying the music these made, very close to what the OEM audio note OPT created. Then I discovered the 572-10 tube runs better with a lower impedance OPT. So I then purchased a pair of Hammond 1629 SAE OPT's, 6.5k ohm impedance. I installed these and yes the amp sounds better with these 6.5K OPT's and measures better as well.
These1638 SAE OPT's (10k ohm impedance) have less than 500 hours on them. Leads were never shortened, although I did crip some copper ring connectors to the output side as my amp uses an impedance switch. I even have the mfg. box they were shipped to me in.
Asking $310.00 for the pair and actual shipping cost. I am in Knoxville, TN.
These1638 SAE OPT's (10k ohm impedance) have less than 500 hours on them. Leads were never shortened, although I did crip some copper ring connectors to the output side as my amp uses an impedance switch. I even have the mfg. box they were shipped to me in.
Asking $310.00 for the pair and actual shipping cost. I am in Knoxville, TN.
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211 & 845 are the most common ones used with 10K impedancefor what tubes like is 10K a typical primary in a single ended setup?