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previous: Mark Knapp I just built a 5E3, and I used a MO... -- 1/16/2000 7:08 AM

Re: Specs for PT/OT for Tweed Deluxe

1/16/2000 8:03 PM
Bruce	Re: Specs for PT/OT for Tweed Deluxe Bill, yhe only problem is those tweed amps were wound with power transformers that were expecting to see only 115vac-117vac on the primary. I've had as many tweeds on my bench as most techs and when you adjust your variAC to those voltages, you'll see the B+ and plate Vdc drop down quite a bit. The reissue Deluxe Reverb PT is way to high of voltage in most cases for a tweed Deluxe and the 5v line is built to use a 5U4G not a 5Y3. Over kill in this little amp with two 6V6s and two 12AX7s. I have a few at work and I'll check them but it seems like the secondary is closer to 355vac. Also, although a reissue SF Deluxe Reverb OT has a good primmary Zed with an 8 ohm speaker..good for driving a pair of 6V6s class AB fixed bias, they have nothing else in common with a tweed Deluxe OT and the cathode bias of a tweed. I'm sure you can get a very good sounding amp with one but not a real tweed sounding amp. Now if you want to have some fun, build the amp with those SF Deluxe Reverb trannys mentioned above but use a 5AR4 and 6L6Gs instead. You'll end up with a very cool sounding 22-25 watt cathode biased tweed Super type amp. Bruce

1/16/2000 8:03 PM

Bruce

Re: Specs for PT/OT for Tweed Deluxe

Bill, yhe only problem is those tweed amps were wound with power transformers that were expecting to see only 115vac-117vac on the primary.
I've had as many tweeds on my bench as most techs and when you adjust your variAC to those voltages, you'll see the B+ and plate Vdc drop down quite a bit.
The reissue Deluxe Reverb PT is way to high of voltage in most cases for a tweed Deluxe and the 5v line is built to use a 5U4G not a 5Y3. Over kill in this little amp with two 6V6s and two 12AX7s.
I have a few at work and I'll check them but it seems like the secondary is closer to 355vac.
Also, although a reissue SF Deluxe Reverb OT has a good primmary Zed with an 8 ohm speaker..good for driving a pair of 6V6s class AB fixed bias, they have nothing else in common with a tweed Deluxe OT and the cathode bias of a tweed.
I'm sure you can get a very good sounding amp with one but not a real tweed sounding amp.
Now if you want to have some fun, build the amp with those SF Deluxe Reverb trannys mentioned above but use a 5AR4 and 6L6Gs instead.
You'll end up with a very cool sounding 22-25 watt cathode biased tweed Super type amp.

Bruce

Replies:

Mark Knapp Don't take this the wrong way, I am... -- 1/16/2000 9:12 PM
Lee >Also, although a reissue SF Deluxe... -- 1/17/2000 12:38 PM