AIMS VTG-105

[PRR]

For speaker repair, permanent or removable is no real difference.

It needs to be flexible, not hard like Duco (nitrocellulose) or Elmers ("white glue", like modern carpenter's glue except cheaper).

Long ago there was a jar of rubber cement in every home, office, and dormitory, so that is what we used. Now that we keep pictures in a cloud instead of an album, I guess rubber cement is going out of style.

[maddog55]

Update....All Filter Caps replaced. New tubes, two 6550 Power tubes, two 12at7 and four 7025 (ECC83 S). Have a pretty wicked 60 cycle hum now. If I keep the volume down around 3, which is plenty loud enough playing at home. No hum, sounds sweet. As I pump volume up hum gets louder. Any ideas? Or is this just to be expected from a 105 Watt Amp?

[92Volts]

A typical or "acceptable" level of hum is relative to the signal, so yes, a powerful amp may hum louder than a smaller amp. Hard to say if this level of hum is expected with your amp though, it depends so much on the circuit, layout, quality of wiring in your house, guitar (particularly pickups)... etc.

If there is a problem it could be the filtering caps for the preamp aren't hooked up properly. Or your balancing resistors are sucking too much current, and overloading the cap's ability to filter the power. If you used 220k instead of 22k for all of those resistors, that problem should have been solved.

Otherwise it could be a grounding issue, particularly near the input or involving the input.

[Sonny ReVerb]

Make sure the hum is coming from the amp and not extraneous sources before troubleshooting. Been there, done that ;) Try it in another room with all lights, motors, heaters, etc. turned off to see if the hum changes or disappears.

[shooter]

wicked 60 cycle hum now.

besides the suggestions made, roll in different tubes into locations prior to the volume, I have had "new" tubes hum. 

[SoundmasterG]

Some of the AIMS amps use a single common filter cap for all preamp and phase inverter stages. This could be a cause though you would think someone would have noticed excessive hum before on the amps if that was the case.


Greg

[maddog55]

Thanks for the tips and input. Tried some of the suggestions but still have hum. Hoping new tubes just need time to settle in. Put it all back together, painted cabinet, cleaned up hardware and replaced grill cloth.

[maddog55]

Wish there was a way to post sound files on this forum. Amplifier starts a rapid clicking sound after it has been on for about 20-30 minutes. Am I looking for a loose connection? Replaced filter caps,do I need to replace all caps? I certainly am not experienced with electronics repair but am able to work on just about anything with some advice and information. Way back in the 70s I built a Heathkit guitar amp, don't remember the watts but it had 2- 12" speakers and a horn driver. Made a loud "thunk" when you powered it on. Solid state, no tubes. Could take this to someone to fix but would like to do the work myself.

[shooter]

starts a rapid clicking sound after it has been on for about 20-30 minutes.

when it starts, turn your trem knobs to zero, make a difference?
does it make the sound with nothing plugged in?

[maddog55]

Trem is off when clicking starts and there is no difference if I turn it on. Yes the clicking is there even with nothing plugged in. Left amp on for several hours last night and it eventually stopped and did not come back.

Thanks

[stevehoover]

Best luck with torn cones I have had is a product called Goodyear Plio-Bond.


Ace hardware still stocks it, you can thin it with Bestine if needed.


Comes in a small tube or glass bottle with applicator.


I repaired a Jensen 15 on an old Supro Thunderbolt decades ago and it still is in the amp last time I saw it.

[maddog55]

Need some suggestions on this one. After amp has been on for about 30 seconds it begins "ticking" from the speakers. Does this for about 45 minutes, ticking sound getting faster and faster then it stops???

[shooter]

Need some suggestions

plug headphones, or powered computer speakers in the pre-out hole, hear tcking

[SoundmasterG]

A late 50's Gibson GA-20T that I overhauled did that also, for awhile. My uncle used to have it and when he got sick and couldn't play anymore my brother bought it. Ever since my brother got it, it doesn't tick anymore. Nothing was changed on the amp since it used to tick at my uncle's, except the electrical supply is in a different state. I can't see how that would make a difference unless the AC line was super dirty up where my uncle lived as compared to where my brother lives....I never did figure out the cause.


Greg

[sluckey]

Which state?   

[SoundmasterG]

Which state?   

The state of huuuuuummmmmm! 


My uncle was in Auburn, Washington, and my brother is in the Portland, Oregon area.


Greg

[sluckey]

That sounds more like the state of brrrrrrrr! 

[pompeiisneaks]

That sounds more like the state of brrrrrrrr! 

Dunno, I live in the Seattle area, and it's been the second coldest I remember since I've moved here 4 years ago and it was 28F yesterday.  We had like a week the first year that got down to 18F.  Utah, where I grew up, otoh, was regularly sub 0 in the winters in many areas, and always had a month of teen temps.  so it 'can' get cold here, but usually not as often or as severe as other places I've lived/been.  :)

In fact the second coldest I've ever been was in the army in spring in GA when we had to lay in wet hasty fighting positions in april in mud for hours in the humid cold south :P  that was a horrorshow :D

First was duck hunting in UT in december, without waders, in you know what high water :P
~Phil

[SoundmasterG]

Sluckey,


Phil is right, it can get cold here but not as cold as many other places across the US. That said, I was in LA over xmas and the low 70's was nice. But coming back to the NW I immediately noticed the much nicer and cleaner air I was breathing, even though it was cold.


Greg

[shooter]

28F yesterday

WOW a heat wave, this morning my car said -5, the radio said windchill -15, but the sun is up, without heat, but the snow sparkles nice

[pompeiisneaks]

Sluckey,


Phil is right, it can get cold here but not as cold as many other places across the US. That said, I was in LA over xmas and the low 70's was nice. But coming back to the NW I immediately noticed the much nicer and cleaner air I was breathing, even though it was cold.


Greg

Oh man the clean air up here is wonderful, Utah has horrible air problems in the SLC area, yellow skies when you can see through the soup.  I went back to visit family last xmas/new years and felt sick the whole time due to the toxic crap air.  Got back here and felt amazing :P

~Phil

[SoundmasterG]

Sluckey,


Phil is right, it can get cold here but not as cold as many other places across the US. That said, I was in LA over xmas and the low 70's was nice. But coming back to the NW I immediately noticed the much nicer and cleaner air I was breathing, even though it was cold.


Greg

Oh man the clean air up here is wonderful, Utah has horrible air problems in the SLC area, yellow skies when you can see through the soup.  I went back to visit family last xmas/new years and felt sick the whole time due to the toxic crap air.  Got back here and felt amazing :P

~Phil

Yeah clean air is one of the best things about the northwest! The year round green too, though we pay the price with much of the year rain....its still worth it though.

Greg

[TIMBO]

That is one COOL looking beast. Awesome!