Peavey transformers; filament winding capabilities

[rootz]

Hi guys,

Hope you are all doing well and can survive these times healthy and otherwise good condition.

I'm looking for more experiences with Peavey transformers, especially the transformers from a VT Deuce. There are a couple of these amps on a local online marketplace. Normally the transformers would power just 4 power tubes, so that current draw for the filaments won't be a problem. I would like to add 5 preamp tubes, so 1.5 A extra of draw from the heater supply. Can the Deuce transformers deliver the goods? People having experience with running EL34's in a Deuce chime in too please. If it can handle that, it will do the extra preamp tubes as well.

Looking for info like:
- heat buildup in the transformer due to the extra load 9how hot exactly would be nice to know);
- sagging of the heater supply due to extra load.

Thanks in advance for sharing your knowledge!

[erwin_ve]

Hi guys,

Hope you are all doing well and can survive these times healthy and otherwise good condition.

I'm looking for more experiences with Peavey transformers, especially the transformers from a VT Deuce. There are a couple of these amps on a local online marketplace. Normally the transformers would power just 4 power tubes, so that current draw for the filaments won't be a problem. I would like to add 5 preamp tubes, so 1.5 A extra of draw from the heater supply. Can the Deuce transformers deliver the goods? People having experience with running EL34's in a Deuce chime in too please. If it can handle that, it will do the extra preamp tubes as well.

Looking for info like:
- heat buildup in the transformer due to the extra load 9how hot exactly would be nice to know);
- sagging of the heater supply due to extra load.

Thanks in advance for sharing your knowledge!

Hi Rootz,

Doing well!
I built 2 amps using the VT Deuce transformers. A #102 and a HRM. (Both 6L6GC)
Power transformers in my builds are warm and not hot when powered for 1 hr.
The PT is a export model with 220-and 240 primaries. The 220v are too high/ on the edge with load. The 240v on a good day((high 23X-240 wall voltage) does give a 6,1-6,3V under load.

Erwin

[rootz]

Thanks Erwin, that sounds promising.

This is the amp I’m looking at. Is that what you used? Can you share what a fair price would be for an amp like this one?

http://link.marktplaats.nl/m1524991944? ... nt=app_ios

[erwin_ve]

Yes correct, that's what I used. Depending on the tubes and speakers(this one has Celestion) they go between 150-175.
The #102 built with these transformers was instant sweetness. I think the old transformers are a bit more mellow on the topend.

[rootz]

Good to know that can take a normal Dumble. Will it do 2 preamp tubes extra, I dunno.

The guy actually wants € 200,- for it and refuses to tell me what output tubes are in it and how old they are because he thinks I'm not a serious bidder. To be honest, I placed a € 100,- bit, as a negotiation start. I reckon that would be cheap lol...

[Aaron]

Hi Rootz,

Doing well!
I built 2 amps using the VT Deuce transformers. A #102 and a HRM. (Both 6L6GC)
Power transformers in my builds are warm and not hot when powered for 1 hr.
The PT is a export model with 220-and 240 primaries. The 220v are too high/ on the edge with load. The 240v on a good day((high 23X-240 wall voltage) does give a 6,1-6,3V under load.

Erwin

Hi Erwin,

Do you know the part number for power transformer that you used. I've got a set but the PT was replaced and is bigger. Ive looked at the schematics and the part number on mine doesn't match any other amp. I emailed the manufacturer and they couldn't give me any info, reason being that they're specifically made for Peavey. Didn't get any reply from Peavey.

Aaron

[talbany]

Hey Rootz
About to kill the wife but we are fine. (Just kidding) Looks like he has the big bottle TAD 6l's in that amp. More than likely replaced the stock Sylvania STR/387's that came in the thing.Which is kind of a shame since Dumble loved those tubes (ask if the guy still has them if you get it).. IMO these tubes sound wonderful in the OD side with it's clear mids and full lows,however, the TAD's are a decent tube.
BTW. Dumble used the Duce Transformers on quite a few ODS's and some other models. I have quite a few pictures of ODS's loaded with Duce Iron..I run one in my High Plate Skyliner (102) and the thing barely gets warm although I did pop a fan in that one since I had one on hand but dont think it's necessary. Oh and if you get it you might even find a few old Pihers floating around the output section

G12T-75's Good speaker for an ODS! and Burn those colored Knobs
Tony

[dorrisant]

Tony, would you think it would be feasible to build a Bluesmaster with a set of Deuce iron? I have a set that needs to be used somewhere. I'm thinking I'd use 6L6s if I had to but would use EL34s if I could. The OT in this set has a primary Z of 2k3.

[talbany]

Tony, would you think it would be feasible to build a Bluesmaster with a set of Deuce iron? I have a set that needs to be used somewhere. I'm thinking I'd use 6L6s if I had to but would use EL34s if I could. The OT in this set has a primary Z of 2k3.

Good question? I have not used or have seen an ODS that had 34's using Peavey Iron so I cannot tell you for sure how the amp would respond? but my guess would be less bass response and a bit less power (voltage dependant). I generally find that the best sounding amps I've built w/34's have the Marshall style (Music Man) output transformers. (Pri Z=1.75K) so if your looking to nail the sound of 183 go with Marshall style. If not I would wire the amp to accept both 34's and 6L's and up the PI couplers to .1uF's and as long as your power transformer doesn't get hot on you give it a shot. You can always go back to the 6L's

The luxury of rolling our own amps

Tony

Peavey 5150 Power OPT

[didit]

Hello -

Acquired Deuce transformer set a while ago. Rather than tax that 6.3V winding, my plan is to fit the amp with 1.5A 12.6VDC switching supply. Research needed before choosing specifically which. Obvious easy alternative is separate 1.5A 12.6AC transformer. Wanting an amp to last a lifetime or more so conservative in designing out undo stresses.

Best .. Ian

[erwin_ve]

Hi Rootz,

Doing well!
I built 2 amps using the VT Deuce transformers. A #102 and a HRM. (Both 6L6GC)
Power transformers in my builds are warm and not hot when powered for 1 hr.
The PT is a export model with 220-and 240 primaries. The 220v are too high/ on the edge with load. The 240v on a good day((high 23X-240 wall voltage) does give a 6,1-6,3V under load.

Erwin

Hi Erwin,

Do you know the part number for power transformer that you used. I've got a set but the PT was replaced and is bigger. Ive looked at the schematics and the part number on mine doesn't match any other amp. I emailed the manufacturer and they couldn't give me any info, reason being that they're specifically made for Peavey. Didn't get any reply from Peavey.

Aaron

Hi Aaron,

The xformers came from this amp, it has a transistor driven reverb circuit which has a supply voltage coming from the bias tap. There is also a other Deuce version which has a opamp driven preamp/reverb.

Erwin

[rootz]

Note on rolling EL34's and 6L6's: connect pins 1 and 8 on the output sockets! 6L6's are internally connected there, EL34's aren't. A thing to remember when you use any 6L6 based Dumble layout as a starting point.

Back to the trannies. I'm feeling confident the Peavey transformers will take the extra 3 preamp tubes from a plain ODS. Still not sure if it will take yet another extra two preamp tubes so I can implement my ideas.

I could use a Hammond trance for the filaments. They're fairly cheap. Downside is that they are 2" tall for anything over 6.3V @ 1.2A, so they won't fit inside the chassis. I'm quite liking the idea of a switched psu for the filaments. I've seen people do that before. Done it before too for a preamp, but can't remember the results I got. Any reason why it wouldn't work or things to watch out for? I noticed the Meanwell RS-15-12, 12V (adjustable), 1.2A, tiny and dirt cheap! Two of those would power preamp heaters and relays for less than 20 bucks! Still looking for the catch though.

[sluckey]

Note on rolling EL34's and 6L6's: connect pins 1 and 8 on the output sockets! 6L6's are internally connected there, EL34's aren't.

Pin 1 and pin 8 have never been internally connected on a 6L6. A long time ago when 6L6s had a metal shell, the shell was connected to pin 1 so that it could be connected to ground to use the metal shell as a shield. But the glass 6L6 tubes have no connection to pin 1. Some manufacturers don't even put a pin 1 on the base. The Fender blackface amps take advantage of the 6L6 pin 1 not being connected. Look at an AB763 layout and you will see a 1.5K grid stopper connected between pin 1 and pin 5.

[didit]

Hello -

Meanwell is one of the reputable SMPS suppliers. I would be comfortable trying one. Transient high current at start up might be an issue, so I might go with RS-25-12 for a higher max rating than the sum of spec'ed heaters. Several sensitive bits of audio gear here with various integrated off-the-shelf SMPS blocks, including Meanwell, that work just fine.

Hammond has a low profile series with this 12.6V @ 1.9A -- https://www.hammfg.com/files/parts/pdf/229C12.pdf -- however really requires soldering into a board of some sort, and all that entails.

Best .. Ian

[rootz]

Note on rolling EL34's and 6L6's: connect pins 1 and 8 on the output sockets! 6L6's are internally connected there, EL34's aren't.

Pin 1 and pin 8 have never been internally connected on a 6L6. A long time ago when 6L6s had a metal shell, the shell was connected to pin 1 so that it could be connected to ground to use the metal shell as a shield. But the glass 6L6 tubes have no connection to pin 1. Some manufacturers don't even put a pin 1 on the base. The Fender blackface amps take advantage of the 6L6 pin 1 not being connected. Look at an AB763 layout and you will see a 1.5K grid stopper connected between pin 1 and pin 5.

I wasn't accurate enough. EL34's have g3 on pin 1 and cathode on pin 8, so not internally connected. G3 and the cathode are internally connected in a 6L6. So they are interchangeable when pins 1 and 8 of the output tube sockets are connected.