What's with the new SVT's?

[Enzo]

Rastus, don't wory about Mykey. He shows up now and then, spams the board with his bullshit and disappears into the night until someplace else gets tired of him and he comes back.

He keeps ranting about overheating output transistors when everyone else here is talking about a tube amp. He doesn;t understand the difference between a FUNCTIONING protection circuit that is over sensitive for SOME styles of play, and an amp that is actually broken. This amp is not broken, it merely needs slight adjustment to the circuit for use in this manner. The amp was never unrealiable from circuit failure, it was not performing as we'd prefer due to properly operating as designed.

Mykey is the kind of person who would tell you you should have had a son when your daughter loses the dance contest.

[drewl]

well, that was quite an "interesting" discourse....
so, there may be a design flaw, but some real nice helpful people found a fix for it, I'd be thankful for the advice.

[Steve Conner]

Well, I've always had a lot of respect for the tube SVTs and I'm not a Republican! :P I don't see how they just suddenly became junk when SLM bought the Ampeg brand. The SVT might be made in the same factory as Crate products now, but it's still a hulking 65lb, no, 85lb tube monster capable of ripping your pant legs clean off at the knees, let alone flapping them. I agree with the observation that you only see the things at really good gigs.

(Yes, no matter what Mykey says, they are tube amps! With real tubes in them. Ampeg also have a couple of solid-state models that carry the SVT name, but we're not talking about those here.)

When I talked about ripping out protection circuits, I meant what I had done to my experimental amps here! I didn't mean that you should go and do it to your SVT reissues That circuit will have been put there for a reason and properly engineered. It probably saves you from a massive blowout if you forget to plug the speaker in, or something. The original SVT used a 4-pin speaker cord to do this, with high voltage on the other two cores, that wouldn't pass modern safety codes.

(I remember something Enzo said in another thread, the major amp manufacturers don't tend to put something out that's completely broken, and then slap their foreheads and go "Oh jeez look at our goof".)

[mykey]

[QUOTE=Steve Conner;53581]Well, I've always had a lot of respect for the tube SVTs and I'm not a Republican!

not republican? maybe there is some hope after all.

[Alex R]

bothering Enzo again (sorry)

post#3 above:

I just posted a service bulletin concerning this matter on ampix - Home in the Enzo gallery. See if it helps.

...that bulletin doesn't seem to be there any more. Any chance you could repost it, Enzo? I have a customer with an SVT shutting down in this way.

[Gtr_tech]

What....noone's gonna bash the Magnavox era Ampegs that were built like later era tube tv's?

[Alex R]

NB this is an ancient thread, I only exhumed it to ask Enzo for the Ampeg service bulletin he mentioned on it, about the overzealous protection circuit on the SLM SVT.

[clyde1]

Yes Alex, I was surprised to see this again, had almost forgotten about it. If I may, the amp in question that started it all has all the protection circuitry upgrades in it and still shuts down. The owner has found that a prolonged warmup time seems to be the answer to this problem. For your information only.

[Tom Phillips]

Alex,
I have a copy I could email to you.
I sent you my email address via PM.
Regards,
Tom

[Alex R]

Thanks Tom, you have mail!

[Two Tone]

I have an amp on the bench with the same problem,
it shuts down after 20 minutes of playing.
Alex or Tom,could you please mail me
the service bulletin,can´t find it on Enzo´s page.
Thanx a lot in advance
hannowirth@yahoo.de

[Enzo]

That is not my web site, ampix - Home is part of the greater Ampage family of fine web sites. It is a part of this place, tboy thoughtfuly provides it as a place to post photos and other images. Anyone can post images there, and even set up their own gallery. I have my own gallery there, mostly schematics too large to post here.

Service bulletin:

[Two Tone]

Thank you Enzo