Can I send you a small Sears tube amp? Where do I send it if so? It has a hum that increases and decreases with the volume knob. I took on the project for a friend and now I'm assured I'm not as capable as I thought.🙁
Always a good idea to mark or color code plug-in connectors with a sharpie before you unplug them, so that you know where they plug back in. The white and blue connectors on the rear left hand corner of the preamp board look the same and I didn't see anything put there by the factory to differentiate which one goes where. By the way, those types of plug-in connectors are prone to oxidizing and they don't clip on all that tightly either, so you can expect problems in a high power bass amp that gets heavily vibrated, not to mention physically shot when somebody carries it around and sets it down hard because their arm is about to pull out of its shoulder socket! At the 3-day Voice of the Wetlands Festival in Houma Louisiana last October, hosted by Tab Benoit, an SVT with an 8 speaker cabinet was the on stage "house" amp for every band and performance, for the first two days or so, until finally it failed after much heavy usage, and was replaced by a Gallien Krueger amp which they must have had as a spare or back up. I don't know if it was a newer or older SVT, probably a newer one; didn't the original SVT have a 9 speaker cabinet?
always appreciate your videos, Terry; but take it easy. What you do always works for us (your customers and viewers, who appreciate your talents and good will to share). But it has to be fun for you, or it isn't really working for anyone in the long run. Be good to yourself, too; not just us folks in RUclips-land. You need to have a life, not just a digital life.
There's such a stigma with these things when it comes to techs, I've met a lot that were uncomfortable being in the same zip code as one. The one I found that was experienced with them had a $90 minimum charge to even look at it.
Hi Terry, it's interesting that you got an SVT in for repair. I just repaired an SVT classic a few days ago, which was a nightmare. The newer SVT's have the output tube sockets mounted on a PCB...6550's no less. one of the output tubes shorted and turned more than 1/2 the board into a hunk of charcoal. I am not fond of output tube sockets mounted on a circus board. What were the design engineers thinking? The older one's made in the 70's were made so much better. in 1980, Magnavox bought out Ampeg and it was down hill ever since. it was later owned by Loud Technologies and now recently acquired by Yamaha..Ampeg used to be made here in my home state...New Jersey. I could tell you war stories that would go on for a week LOL :) I tell my customers to try and find an early 1970's vintage SVT. the early one's not only sounded great, but they were more reliable. Great videos as always. Keep 'em coming :) Watch your lower back with lifting those suckers onto the bench.
I have a V4 and a V4B that I picked up secondhand quite some time ago, sitting on a shelf in the garage waiting for me to get up the gumption to go through them and get them working properly. The v4b is kind of a little brother to the SVT, but that doesn't mean it is little, and it sure as hell isn't lightweight! And yes, it has circuit boards in it of course.
Hi Frank! I've heard other folks say the same thing regarding newer SVTs vs vintage SVTs. I've owned two SLM-era SVTs, and neither matched the volume of a vintage SVT that I used to borrow in the late 70's. That vintage SVT also had a cleaner tone when it was cranked up. There was only a slight bit of overdrive, which was warm and rich in harmonics. Neither of my SLM-era SVTs produced that sound. They went from clean at lower volume to a raspy distortion at gigging volumes. I'll be on the lookout for a vintage SVT. Thanks for your opinion on the newer models. I very much appreciate it. Best regards.
@@derwinmoss5709 One-channel gain/master structured SVT's will always pale in comparison to the two-channel non-master volume versions. Lately, I've been poking around eBay and Reverb, and those vintage 70's units are creeping up in price. No longer can you find them for $1,500 or less. They're in the $2,000 range. I'm gonna save my money a little longer because Ampeg now make a new two-channel SVT that has the same voice, signal path, and everything else as the 1969 (in channel one) and 1975 (in channel two) versions of said amp. It's the 50th anniversary Heritage model and it's built right here in the United States. The volume, tone, and feel absolutely blow away any of the standard SLM or LOUD era offerings. 300 watts of clean headroom just like the old ones. Only downside is the price: $2,700 plus tax.
I don't know if the AV has the same power board as in the VR, anyway, according to the VR schematic diagram, the polarity switch simply connect a 0,0033uF bypass capacitor from GND to main L or N or none.
I think this the first guitar amp I've seen where the tubes are mounted upright instead of upside down. Most consumer electronics is either upright or sideways.
Terry. All your good content is so entertaining and informative that you are starting to make me mad! Just kidding, of course, but your granddaughter's occasional appearance on the channel is just unfair! Thanks, and thumbs up.
have B-25 on bench new output tubes cleaned pots / reseated all jacks worked fine. 1st culprit was bad contact on spkr jack switch. did 3 wire ac cord mod, pulled polarity switch, moved stdby up front where polarity switch went..now i have a that increases with vol on both chan . the guit comes through to.../? have no clue . filter cap hum is usually constant.. this increases with vol control..bad coupling cap in preamp? does same using ext amp output to another amp. its only 50 yrs old..LOL...ps: love your vids..and choice of wines
What was the actual problem and repair here? You seem to say "... input jacks COULD have been the problem all along". Was that the problem this time round? Just curious.
All that money to buy one, and it’s not even a double-sided, plated through board. Wow! Since yo mentioned old TV’s, do you remember when we had to get up and adjust the rabbit ears, or rotate the antenna?
Mr d-lab I have 2 peavy 4 10 classic 50s I do play loud my oldest one had caps change no problem pretty quiet second one 1997 had caps done and has loud hum like the amp peg and could I email the issue to you your far from me but it shows the problem no one seems to can cure
Keep it up bubby. Remember, If you do what you love doing for a living, you never work a day in your life!
Update: Owner reports Hum is gone, never worked better. If you have this issue, take a good look at those PCB mount Cliff input jacks!
Can I send you a small Sears tube amp? Where do I send it if so? It has a hum that increases and decreases with the volume knob. I took on the project for a friend and now I'm assured I'm not as capable as I thought.🙁
Heck Terry, I've been watching your videos for a while now and you always do your best, Much appreciated.
All the best to you Terry! Thanks for taking the time to do videos AND take care of your lucky customers as well!
Laurent
Still worthy of a thumbs-UP, Terry. Thanks for sharing it with us. 73 DE K7RMJ Frank
Always a good idea to mark or color code plug-in connectors with a sharpie before you unplug them, so that you know where they plug back in. The white and blue connectors on the rear left hand corner of the preamp board look the same and I didn't see anything put there by the factory to differentiate which one goes where. By the way, those types of plug-in connectors are prone to oxidizing and they don't clip on all that tightly either, so you can expect problems in a high power bass amp that gets heavily vibrated, not to mention physically shot when somebody carries it around and sets it down hard because their arm is about to pull out of its shoulder socket!
At the 3-day Voice of the Wetlands Festival in Houma Louisiana last October, hosted by Tab Benoit, an SVT with an 8 speaker cabinet was the on stage "house" amp for every band and performance, for the first two days or so, until finally it failed after much heavy usage, and was replaced by a Gallien Krueger amp which they must have had as a spare or back up. I don't know if it was a newer or older SVT, probably a newer one; didn't the original SVT have a 9 speaker cabinet?
Good quick fix ( at least quick in the video) From a musician thanks for taking care of those guys. Good stuff Terry as usual
Thanks Terry. My back couldn't handle that heavy amp!
always appreciate your videos, Terry; but take it easy. What you do always works for us (your customers and viewers, who appreciate your talents and good will to share). But it has to be fun for you, or it isn't really working for anyone in the long run. Be good to yourself, too; not just us folks in RUclips-land. You need to have a life, not just a digital life.
So you fixed it 9 months ago, and now the same problem again.
Forgive me if I don't feel complete confidence in you lol
There's such a stigma with these things when it comes to techs, I've met a lot that were uncomfortable being in the same zip code as one. The one I found that was experienced with them had a $90 minimum charge to even look at it.
More vids for us, and more wine for you!
I love old SVTs. New ones are a nightmare.
Hi Terry, it's interesting that you got an SVT in for repair. I just repaired an SVT classic a few days ago, which was a nightmare. The newer SVT's have the output tube sockets mounted on a PCB...6550's no less. one of the output tubes shorted and turned more than 1/2 the board into a hunk of charcoal. I am not fond of output tube sockets mounted on a circus board. What were the design engineers thinking? The older one's made in the 70's were made so much better. in 1980, Magnavox bought out Ampeg and it was down hill ever since. it was later owned by Loud Technologies and now recently acquired by Yamaha..Ampeg used to be made here in my home state...New Jersey. I could tell you war stories that would go on for a week LOL :) I tell my customers to try and find an early 1970's vintage SVT. the early one's not only sounded great, but they were more reliable. Great videos as always. Keep 'em coming :) Watch your lower back with lifting those suckers onto the bench.
I have a V4 and a V4B that I picked up secondhand quite some time ago, sitting on a shelf in the garage waiting for me to get up the gumption to go through them and get them working properly. The v4b is kind of a little brother to the SVT, but that doesn't mean it is little, and it sure as hell isn't lightweight! And yes, it has circuit boards in it of course.
Hi Frank! I've heard other folks say the same thing regarding newer SVTs vs vintage SVTs. I've owned two SLM-era SVTs, and neither matched the volume of a vintage SVT that I used to borrow in the late 70's. That vintage SVT also had a cleaner tone when it was cranked up. There was only a slight bit of overdrive, which was warm and rich in harmonics. Neither of my SLM-era SVTs produced that sound. They went from clean at lower volume to a raspy distortion at gigging volumes.
I'll be on the lookout for a vintage SVT. Thanks for your opinion on the newer models. I very much appreciate it.
Best regards.
@@derwinmoss5709 One-channel gain/master structured SVT's will always pale in comparison to the two-channel non-master volume versions. Lately, I've been poking around eBay and Reverb, and those vintage 70's units are creeping up in price. No longer can you find them for $1,500 or less. They're in the $2,000 range. I'm gonna save my money a little longer because Ampeg now make a new two-channel SVT that has the same voice, signal path, and everything else as the 1969 (in channel one) and 1975 (in channel two) versions of said amp. It's the 50th anniversary Heritage model and it's built right here in the United States. The volume, tone, and feel absolutely blow away any of the standard SLM or LOUD era offerings. 300 watts of clean headroom just like the old ones. Only downside is the price: $2,700 plus tax.
The ONE thing I needed..how to get to the other pre amp tubes...cant pull that front panel off. You forwarded over
I don't know if the AV has the same power board as in the VR, anyway, according to the VR schematic diagram, the polarity switch simply connect a 0,0033uF bypass capacitor from GND to main L or N or none.
I think this the first guitar amp I've seen where the tubes are mounted upright instead of upside down. Most consumer electronics is either upright or sideways.
Terry. All your good content is so entertaining and informative that you are starting to make me mad! Just kidding, of course, but your granddaughter's occasional appearance on the channel is just unfair! Thanks, and thumbs up.
There's a machine designed to unleash thunder!
have B-25 on bench new output tubes cleaned pots / reseated all jacks worked fine. 1st culprit was bad contact on spkr jack switch. did 3 wire ac cord mod, pulled polarity switch, moved stdby up front where polarity switch went..now i have a that increases with vol on both chan . the guit comes through to.../? have no clue . filter cap hum is usually constant.. this increases with vol control..bad coupling cap in preamp? does same using ext amp output to another amp. its only 50 yrs old..LOL...ps: love your vids..and choice of wines
Never been a fan of surface mount input jacks. Try to change them out at the first opportunity I get.
When do you have time to do all these repairs and videos? I thought you had a day job. Good work!
Hello, Yes, I do. The day job eats up 10 hours, so its warp drive every night to try and accomplish a repair.
What was the actual problem and repair here? You seem to say "... input jacks COULD have been the problem all along". Was that the problem this time round? Just curious.
Bad solder connections, plus worn jacks appear to be the issue. Was in a bit of a time pinch to narrow down the exact cause
Nice!!
Old svts are the only way to go.
All that money to buy one, and it’s not even a double-sided, plated through board. Wow! Since yo mentioned old TV’s, do you remember when we had to get up and adjust the rabbit ears, or rotate the antenna?
Mine developed a bad hum, was the 12AX7 inverter tube
Is it me or is the actual component repair missing ??
Just a Tech Tip, not a full feature repair
@@d-labelectronics Sorry . Its me just being an ungrateful SOB. I really do enjoy the "eureka" i found the fault moments thou. Cheers
Interesting there's no handle on the top. maybe it's just TOO heavy for one handle!
Mr d-lab I have 2 peavy 4 10 classic 50s I do play loud my oldest one had caps change no problem pretty quiet second one 1997 had caps done and has loud hum like the amp peg and could I email the issue to you your far from me but it shows the problem no one seems to can cure
Where are you located? It would be great to have a music repair shop locally like yours who knows well about this stuff.
Battle Creek, MI
wow I never knew those svts were built so cheaply
Mine is lowering the sound while i m playing . Whats the issue ?
So Terry....when are you going to retire and become full time D-Lab!!
Kerry G if he retire from where he will get the amp if not from clients.
@@ot4kon he has a regular day job maybe?
2:50 lol
tell owner to save his back with a quilter bass block-only weighs 4 pounds and won't let ya down. 800 watts