Scott 299B, blown transformer?

[NOSValves]

Looking at the picture - your only option is to dump this thing and buy a new transformer, unless you want ticking bomb in your room and have fire extinguisher ready.

I suspect that output transformers can be in the same poor shape. I would check them too.

yup pay the $100 or so and get a new transformer you are not going to get any longevity out of that mess no matter what you do. Don't waste your time like is to short.

Call up Heyboer in Michigan and tell them you want a HH Scott 222C transformer you will need to use the mounting hardware from the original to side mount it. All the Scott 7189 based amplifier will work just fine with the same power transformer model.

 

[Wharfcreek]

I agree w/ For P1..... using that PT would be like having a ticking time bomb in your room. That said, I'm also a big advocate of Heyboer! Phil Heyboer is a great guy, and he'll take good care of you. They're located in Grand Haven, Michigan.....a family owned business....and they still remember how to work with people! By the way, I think Craig's correct about using a 222 transformer for your 299B. And, I would also mention that in looking at your pics....I'm incline to believe that your PT did die from 'California Exposure'....looks more like plain and simple 'overheat' to me....most likely caused by excessive current draw somewhere. I'd be VERY careful in getting that thing up and running again. I'd go through all the basic checks....and watch for what may have been the root cause of the problem....perhaps in the bias circuit...but also perhaps a bad tube.....possible short in an output transformer.....or maybe even bad power supply filter caps. I'm guessing the transformer did NOT die of natural causes......it was murdered!!

 

[valvestart]

OT and Rewinding

Ok I agree with For P1 and Wharfcreek about my PT, I won't surely use it in that conditions anyway there is a fuse to protect the circuit that melts at 2.5A, that is why when I tested it with my variac I never reached 2A.
I also agree that the PT was murdered, then I checked an outpout transformer. As you can see on the attached photos it is in better conditions, the paper doesn't breacks in pieces, maybe it is not perfect just a little dry.

Thanks for the advice about Heyboer, they are well known for their job. Surely buying a new PT will lead to certain results but I would check how resonable is a rewinding.
My analysis is the PT is not safe since layers that divides the windings are damaged but should be not too difficult to unwind and substitute these layers with a winding machine and rewind the same wire.
Thanks to s-petersen for the link, the job made there was more difficult since were added more windings to modify the voltage.
Can anyone address me to someone that can rewind my PT? Do you think is a good option to rewind it?

I'm completely new to this forum and the tube world then I need some time to speak the proper language.

Thanks,

Rob

 

[jaymanaa]

How 'bout we thank him for his INdisposability instead? (Well, actually, YOU guys can thank him... I only just joined this thread a minute ago, so I'm a bit out of my element)

Seems kinda' blasphemic to use the word "disposable" when talking to a tube-amp guy. Maybe it's just me...

Thanking him would be like feeding a stray dog steak, he will keep coming around if you do. Nah, everyone in tubes has fun, and Craig knows I'm just yankin his chain. We used to butt heads a bit, but that's how we all learn sometimes. I'd dare say we are friends now, and the disagreements used to come from both of us being passionate about tube audio.

I still wouldn't feed the ****er a steak though (maybe a hamburger).

 

[NOSValves]

Thanking him would be like feeding a stray dog steak, he will keep coming around if you do. Nah, everyone in tubes has fun, and Craig knows I'm just yankin his chain. We used to butt heads a bit, but that's how we all learn sometimes. I'd dare say we are friends now, and the disagreements used to come from both of us being passionate about tube audio.

I still wouldn't feed the ****er a steak though (maybe a hamburger).

Jay you really have to stop. I'm about to bust gut this is some funny shite!!

I think your language requires your post to be removed :nono:

 

[jaymanaa]

Jay you really have to stop. I'm about to bust gut this is some funny shite!!

I think your language requires your post to be removed :nono:

Membership has it's privileges.

We are going to have to revisit the Scott front end and power section one of these days.

 

[larryderouin]

Valvestart. I had a FISHER MPX-100 just done by Heyboer. Alden there explained that it would actually cost 2-3 times more to rewind the old one than to wind a new one due to having to unwind and clean the core laminations and make sure they were straight and flat.

Provided they have the voltage/amps for each section it's easier and for less $$ than tearing yours down and rewinding it. My MPX-100 cost $65.00 and I sent the old endbells and they put them on the new transformer. A rewind of the old core would have cost about $200. And Heyboer wan't the only Co I contacted. The High was $275 and low was $180 for a rewind. So I went for the new tranny.

Larry

 

[valvestart]

Thanks for the informations larryderouin, they were useful. Is not reasonable to pay that prices to rewind it then I want to try to rewind it myself. I don't feel quite happy to put a reproduction of the original PT not only for historical reason, in fact it seems that vintage PT sound better.