In Reply to: lesson learned-don't try to be too tricky! posted by vinnie2 on August 4, 2017 at 15:59:43:
But it sounds great. The psu module in the middle started life out as the psu for my 91A 300B clone, then morphed into the 813 amp, and now it will live it's third life as the psu for my triode connected 6bq5 PP amp. It is a very nice psu and is dead quiet with this amp. I designed it with psud2. Even with my ear against the speaker there is absolutely no hum. I am sure the fact it is PP helps. I am so use to fighting hum on SET's it knocks me over to hear nothing at all.
Changed over to using 6 volts on the 12at7 filaments as suggested, works just fine. I have a 6A 6.3v winding on the power tranny so it can run the four 6bq5's and the two 12at7's and still have more than 2A left by my count. Thanks for the tip guys, it will make for a neater build.
In the bottom photo the other unit in the center is my everyday filament voltage supply for the bread board panels and the unit on the far left is the everyday psu for the bread board panels. Neither is connected to anything in this set up.
You can see the old front end module in the back ground of the top photo. I will either make a new top plate for this amp or cover the old holes with new pieces of plate and make new holes for the 6bq5 sockets. I really like to repurpose whenever I can, it saves a lot of work and material. Just got to order a few parts (resistors and sockets) and we will get going on the final build. Thanks again for all the help.
Edits: 08/05/17 08/05/17 08/05/17 08/05/17 08/05/17 08/05/17 08/05/17 08/05/17 08/05/17 08/05/17 08/05/17 08/05/17This post is made possible by the generous support of people like you and our sponsors:
Topic - lesson learned-don't try to be too tricky! - vinnie2 15:59:43 08/04/17 (8)
- RE: wildest bread board yet..... - vinnie2 06:51:44 08/05/17 (2)
- RE: wildest bread board yet..... - Triode_Kingdom 11:15:44 08/05/17 (1)
- RE: wildest bread board yet..... - vinnie2 12:15:35 08/05/17 (0)
- thanks to all... I will give 6 vac a try nt - vinnie2 04:41:29 08/05/17 (0)
- 12AT7 runs fine on either 6.3 or 12.6 V........ - Steve O 16:27:15 08/04/17 (3)
- RE: 12AT7 runs fine on either 6.3 or 12.6 V........ - vinnie2 18:35:55 08/04/17 (2)
- RE: 12AT7 runs fine on either 6.3 or 12.6 V........ - Triode_Kingdom 19:48:51 08/04/17 (0)
- RE: 12AT7 runs fine on either 6.3 or 12.6 V........ - Tre' 19:36:19 08/04/17 (0)