This Peavy OT at 2.1k is looking like a good candidate
https://www.tubeampdoctor.com/en/output ... -6505-6534
Search found 1665 matches
- Sat Nov 05, 2022 12:33 pm
- Forum: Dumble Discussion
- Topic: 6550 OT Primary Z Question
- Replies: 31
- Views: 3110
- Sat Nov 05, 2022 10:16 am
- Forum: Dumble Discussion
- Topic: 6550 OT Primary Z Question
- Replies: 31
- Views: 3110
Re: 6550 OT Primary Z Question
Hello -- If the Sunn amp in question is from early 1970s it would be an A451 as mentioned a few years back in the thread, it has 2k2 primary along with UL wiring. The power section in Sunn's schematic for the 2000s is an example. Literally copy/paste of Dynaco's quad pentodes UL design target 200-2...
- Fri Nov 04, 2022 6:30 pm
- Forum: Dumble Discussion
- Topic: 6550 OT Primary Z Question
- Replies: 31
- Views: 3110
Re: 6550 OT Primary Z Question
Thanks again for the input Martin. It's my first time looking at non Fender style transformers, and the 6550 has always been on my list. One other option I Iooked at is the Sunn OT which has 2.5K primary. I think it's wired Ultralinear and probably putting 500V+ on plates. I never tried UL wiring an...
- Thu Nov 03, 2022 7:19 pm
- Forum: Dumble Discussion
- Topic: 6550 OT Primary Z Question
- Replies: 31
- Views: 3110
Re: 6550 OT Primary Z Question
I was checking the 6550 spec sheet on this thread and for class AB, two matched tubes and fixed bias the recommended primary at 450V is 4K. I am thinking of building an amp with 525V (plates) so a bit higher. But for a quad of tubes the primary at 450V is half = 2K. I am wondering if the primary sh...
- Wed Nov 02, 2022 5:37 pm
- Forum: Dumble Discussion
- Topic: 6550 OT Primary Z Question
- Replies: 31
- Views: 3110
Re: 6550 OT Primary Z Question
Reviving this old thread. I was checking the 6550 spec sheet on this thread and for class AB, two matched tubes and fixed bias the recommended primary at 450V is 4K. I am thinking of building an amp with 525V (plates) so a bit higher. But for a quad of tubes the primary at 450V is half = 2K. I am wo...
- Tue Nov 01, 2022 6:59 pm
- Forum: Dumble Discussion
- Topic: Does that sound like a Dumble Amp to you?
- Replies: 23
- Views: 3301
Re: Does that sound like a Dumble Amp to you?
<r><QUOTE author="ijedouglas" post_id="445953" time="1667327856" user_id="17512"><s>[quote=ijedouglas post_id=445953 time=1667327856 user_id=17512]</s> No idea, not sure where I got the pic from either. It looks like 2 Dumbleland 300SL on the left with an ODS on the right... <e>[/quote]</e></QUOTE> ...
- Sun Oct 30, 2022 9:13 am
- Forum: Dumble Discussion
- Topic: Silver alligator build.... problem.
- Replies: 9
- Views: 2713
Re: Silver alligator build.... problem.
Hi Sergio, That was a guesstimate from the photo copies. Rafael did a great schematic after more info was available. The one I built worked out fine, I built another version and it was a nightmare. Couldn’t get the right balance volume wise and had a horrible thumping sound. Went completely differe...
- Sat Oct 29, 2022 10:43 am
- Forum: Dumble Discussion
- Topic: Silver alligator build.... problem.
- Replies: 9
- Views: 2713
Re: Silver alligator build.... problem.
This is correct, same happens in fender amps with that circuit. It's because you have a low resistance to ground and hence bleeding a lot of signal
Which schematic did you use?
Which schematic did you use?
- Fri Oct 21, 2022 8:57 am
- Forum: For Sale/Trade
- Topic: Amplified Nation JM/Wonderland Chassis and Board Sets - IN STOCK 12/22/22
- Replies: 23
- Views: 7644
Re: Amplified Nation JM/Wonderland Chassis and Board Sets
As we approach end of Oct and there has been no response I am assuming this is no longer available?
- Fri Sep 30, 2022 5:23 am
- Forum: For Sale/Trade
- Topic: Amplified Nation JM/Wonderland Chassis and Board Sets - IN STOCK 12/22/22
- Replies: 23
- Views: 7644
Re: Amplified Nation JM/Wonderland Chassis and Board Sets
Moderators, maybe worth deleting this thread as it seems not being offered anymore?
- Sun Sep 25, 2022 6:28 am
- Forum: For Sale/Trade
- Topic: Amplified Nation JM/Wonderland Chassis and Board Sets - IN STOCK 12/22/22
- Replies: 23
- Views: 7644
Re: Amplified Nation JM/Wonderland Chassis and Board Sets
Did you ever do this run? I'd be down for one or two
- Fri Sep 16, 2022 7:35 pm
- Forum: Fender Discussion
- Topic: 1965 Bandmaster hum
- Replies: 93
- Views: 12349
Re: 1965 Bandmaster hum
I thought about giving up to be honest, but just needed some time away from it and distance. I'm glad it worked out and hopefully it will help others in the futurejohnnyreece wrote: ↑Fri Sep 16, 2022 5:35 pm Thanks for chiming in with a follow-up! I wondered how this turned out. Glad you didn't give up!
- Fri Sep 16, 2022 7:34 pm
- Forum: Fender Discussion
- Topic: 1965 Bandmaster hum
- Replies: 93
- Views: 12349
Re: 1965 Bandmaster hum
Sorry, switchmartin manning wrote: ↑Fri Sep 16, 2022 5:41 pmStandby pot?Bombacaototal wrote: ↑Fri Sep 16, 2022 4:41 pm...plus the standby pot was loose and this was replaced
Thanks for the update!
- Fri Sep 16, 2022 4:41 pm
- Forum: Fender Discussion
- Topic: 1965 Bandmaster hum
- Replies: 93
- Views: 12349
Re: 1965 Bandmaster hum
Just wanted to give an update. The hum was getting inserted from the bias supply. Changed bias cap to higher value, 47uF, and an additional cap across the pot, plus the standby pot was loose and this was replaced
Hum reduced greatly and the amp is fairly in good shape now
Hum reduced greatly and the amp is fairly in good shape now
- Thu Sep 15, 2022 4:37 pm
- Forum: Dumble Discussion
- Topic: SSS known for flabby low end?
- Replies: 14
- Views: 3212