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As far as the groove tube thing, those are actually GE 6550s, a gift of mine to Dennis some years ago. I would personally recommend them if you can find them, but they have to be the GE versions.... |
Hi All, I am about to take possession of an Inspire Fire Bottle 45/2a3 SET amp. It was built 8/22/2019. Curious if anyone has the bias settings requirements and procedures for the 45 and the 2a3 tubes. Know that it takes a 6SL7GT input tube. Do any other work? Any additional information much appreciated too. Looking forward to hearing it! Thanks in advance!
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@C10
I found this on the Internet for the 45/2a3 amplifier from the item description in eBay. PURE CLASS A TRIODE 2 WATT TO 5 WATT OUTPUT WITH VARIOS OUTPUT TUBES 45 OUTPUT TUBES WITH 80 RECTIFIER 2A3 OUTPUT TUBES WITH 5Z3 RECTIFIER 6SL7/6SN7 INPUT TUBES AUTO BIAS FOR PLUG AND PLAY TUBE ROLLING Maybe this will help you |
Actually...
I wish I was on vacay, but instead I'm working this week out of town. However, as I suspected, the amplifier is auto biasing, with the only caveat being use an 80 rectifier with the 45 tubes and a 5Z3 with the 2A3s.
And any of the 6Sl7/6SN7/6BX7 tubes can be used on the front end. You'll have to experiment to see what sounds the best to you... |
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https://img.usaudiomart.com/uploads/...t-tube-amp.jpg https://img.usaudiomart.com/uploads/...t-tube-amp.jpg https://img.usaudiomart.com/uploads/...t-tube-amp.jpg |
The 83V is a 4 pin version of the 5V4G octal and should not be confused with the HG 83 mercury vapor rectifier.
The screws are more like hum Control pot |
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I have the same amp, has anyone try the 83V rectifier tube for more power?
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