5e3 on the cheap

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Posted by David Hutchens [ 66.57.114.211 ] on February 24, 2005 at 21:35:42:

I just rewired an old Bogen 20 watt pa amp with a Tweed Deluxe 5e3 circuit. The power transformer is a little hot (about

430vac with no load) and has no 5vac winding so I'm using the original 6ax5 rectifier tube. The amp sounds pretty good,

a little better than my silver face Champ. My B+ is about 457vdc and the circuit is drawing about 100ma off the

rectifier tube at idle. I'm a little concerned about the high b+ and tube life. Do I need to change the 6v6 cathode bias

resistor value or try to drop the b+ voltage or should I get a new transformer with lower output and a 5vac winding for

a 5y3. I have new tube sockets a blank chassis and a 5e3 eyelet board and want to make a loose copy of the Tweed Deluxe.

If I can use the Bogen transformers I think I can get out between $100 and $150 including speaker and homemade cabinet.

Any suggestions, ideas or observations are appreciated.
David


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