Wow thats was wild.. I own 2 of those svt pros always have a problem with them i play in club's 2xs a week. Its been in the shop more then its been in the studio. Thanks for a great video...again ! Love your work.

Yeah buddy,eagle eye saw the problem and fixed her right up.Hope you added a little hot glue to that wire to keep it in place,vibrations could loosen it up?Great job again,👍✌😎🎸

Terry the electro-detective! I bet many repair techs would not have figured this out. (especially on the Geek squad)! LOL Don

@d-labelectronics

8 жыл бұрын

+umajunkcollector Thanks man, I really appreciate your faith in me

I've ran into some real head scratchers before, gotta say though never nothing as that. Thanks for the tips.

Awesome! I just bought one of these, I hope the tech I'm going to see is as good as you.

@d-labelectronics

8 жыл бұрын

Thank you, I do appreciate the kind comments

Good job Terry!

@d-labelectronics

8 жыл бұрын

+John Simms Thanks John, I appreciate your faith in me man

You can usually buy individual pins for that type of connector.

p6 the tube gain (plate volts in diagram) was appearing blown but in pulling board to verify where to put a 1m bypass resistor, i found pot was ok! It's a bad dirty ground or something. Still trying to figure what's up! Appears i/c pin 4 indeed was the culprit...104v to 298v now instead of 120vdc shown for tp7. still 200w instead of 275 out. ps ampeg told me to f off when i said we need a service bulletin rather than giving me any support

I have a couple questions:1.Where can I get a part list and service manual for my Ampeg SVT Classic. Ampeg won't sale me one because I am not an authorized repair shop.2.On my SVT the nuts and bolts hold the metal plate and power tube circuit board together, the are solder. Do I have to unsold the nut and bold to undo them?3. Is the cathode resistor (6 in total) are they 2 watts or 5 watts? Respectfully,Alexx

excellent work. I have the same head amp your problem is that I turn on but there is no sound, what could it be? Thank you

@sncsrn9892

2 жыл бұрын

Necro post time, but did you ever solve the issue? I have one that power on, produces sound, then mutes itself after a few seconds.

Did you stake the wire to the board after soldering, to keep it from vibrating loose?

@d-labelectronics

7 жыл бұрын

Too long ago to recall

Help help. Ampeg svt 7 pro. Checked all caps randall that blows fuses once turned on. Thanks

I hate it when something flops around in the hole. :-) Btw, that is a bass guitar amp. I see you use a Hakko 936. I have had mine for at least ten years and it still works fine. I did have to buy a new tip a few months ago because somehow the iron fell to the floor and bent the tip. :-((( Still a good video thought. Thanks

@d-labelectronics

8 жыл бұрын

+Robert Hurless I've had that Hakko for 10 years, no issues. Great soldering iron. Had a Tenma before that with lots of problems. Love the hobby

Well thanks in advance ... mine svt 4 came in the shop with no output sound and no power to the pre-amp PCB. After some inspecting i have found 9 broken pins on all 4 connectors .... repaired it and "hot glue" the connectors. Now I have output sound .... but I still have to find out why there is a high squealing sound during warm up ... it goes away after 22 sec .... any help appreciated from the gurus ... thanks

@d-labelectronics

8 жыл бұрын

Hello Billy, When warming up the amp, have you observed in a dark room? You may be able to see arching on the board or disturbance in a tube. I have found on the SVT's that shorts develop in random tubes from the Heater to cathode. When this happens you can see a nice visual on the defective tube. Give that a try. TD

@bhgtanable

8 жыл бұрын

+D-lab Electronics ... thank you sir .... will give it a try and revert ...

I have this same amp and it's been having problems with over heating and is causing the amp to peak and shut off for a second or two? Can you give me advice??

@fernandoalbuquerque1128

Ай бұрын

Bias Adjustment

5:49 Why did the gain go up? That is the problem with my amp. Volume fluctuates. Anyone else have this issue?

Whats a ball park cost-estimate for a Ampeg VT40 transformer.....Im a guitar player and an idiot...Know nothing of tubes,transformers etc...Can you help....amp is an old VT40 1970,s Ampeg..thanks

The SVT 4 PRO is not a PA amplifier.