No input from jack, fx return gives sound.

[Drake]

I have clearly blown v3 and v4, in the preamp. they don’t glow. I replaced them, they glow, but still no sound from the input jack. As stated, I get sound thru the Fx return. Any ideas? Seems like a little more than swapping some tubes. Thanks.

 

[PelliX]

I have clearly blown v3 and v4, in the preamp. they don’t glow. I replaced them, they glow, but still no sound from the input jack. As stated, I get sound thru the Fx return. Any ideas? Seems like a little more than swapping some tubes. Thanks.

Might help if you actually outlined the model of the amp, what may have happened etc.

My first thought is how about V1 and 2? If 3 and 4 died, it stands to reason that perhaps 1 and 2 had a bad day, too, though the filament survived.

A little more backstory and info is required here.

 

[Drake]

It’s a three channel 100 watt amp with el34s and 12ax7s, fx loop. Using 4 CM. No front end, only fx return sound. Thanks.

 

[fitz]

Might help if you actually outlined the model of the amp, what may have happened etc.

nope.

 

[PelliX]

It’s a three channel 100 watt amp with el34s and 12ax7s, fx loop. Using 4 CM. No front end, only fx return sound. Thanks.

Ah, I see. It's probably going to be a problem with the component. The one inside the chassis. Or a valve.

[...]

I'm guessing maybe a TSL? Perhaps post in the Workbench Telepathy section, they're already anticipating your thread.

 

[fitz]

I'm guessing maybe a TSL?

Possibly a 6100 with more than 4 pre-amps?
Is it a Marshall?
How many more guesses do we get?

 

[NumbSkull]

Buy a

BOSS IR-2 AMP & CABINET SIMULATOR IR COMPACT PEDAL.​

Bin the preamp.
Keep the tubes.

 

[maico996]

Ima guess a 1967 RCA television that is not hooked up to the rabbit ears, and the 1973 Pong game only works on channel 3.

 

[Drake]

Thanks everyone, I enjoyed all of your jovial sarcastic comments. If you can’t be helpful….go ahead and comment here as well. Hmmm filters, capacitors. Transformers. When this does that, this happens. Wow…..what forum is this? Jerks anonymous?

uhhh my car has a dead battery……what kind of car do you have? I need more information. Thanks guys….all the best.

 

[fitz]

If you can’t be helpful….go ahead and comment here as well.

If you can't say what amp you have, what kind of help do you expect?
Positive reinforcement?
Ok, I'm sure it can be fixed, whatever it might be.

If you're losing multiple tubes at once, I'd suspect it's a more serious problem than bad tubes, but we may never know.
Best of luck with your issues..., and the amp.

 

[Ronquest]

Internets is hard.

 

[mickeydg5]

Internets is hard.

Drakes is harder.

 

[PelliX]

uhhh my car has a dead battery……what kind of car do you have? I need more information. Thanks guys….all the best.

Strangely enough, different types of cars appear to have different types of batteries, different fuses, tires, etc. Your current inqiury is more akin to "Hi, my lights come on but the car won't start.".

Wow…..what forum is this? Jerks anonymous?

Certainly not! ...we have usernames to identify each jerk, thank you very much.

Let's try a different tangent, as I feel words are not working in your favor; how about some gutshots and a picture of the front, please?

 

[mickeydg5]

Strangely enough, different types of cars appear to have different types of batteries, different fuses, tires, etc. Your current inqiury is more akin to "Hi, my lights come on but the car won't start.".



Certainly not! ...we have usernames to identify each jerk, thank you very much.

Let's try a different tangent, as I feel words are not working in your favor; how about some gutshots and a picture of the front, please?

I feel you are asking far way too much.

 

[Dogs of Doom]

sorry Drake, but, there's an old saying...

ask a ½ assed question, get ½ assed answers...

There is no proof that you blew tubes V3 & 4... Many times pre-amp tubes do not glow, but are working fine, as designed...

The only thing that you've stated that are to be taken as fact are:

it's a 3 channel 100 watt amp
it takes 12AX7 & EL34 tubes
the amp works, when you plug in to the effects return (power section works)
the amp produces no sound when you plug into the guitar input jack (pre-amp not working)

other than that, nobody knows anything...

have you done a visual inspection of the boards, to see if there's any signs of carbon/soot? anything look like it blew up?

If you want help, you have to be willing to help those who want to help you. If you just get upset that they are asking questions, then I guess just take it in to a tech & let them look at it & charge you blindly for whatever they tell you is wrong w/ it...

You could start by answering what amp it is... Is it a TSL100? if so, what year?

did the amp just die suddenly? or was there symptoms prior? Did something happen, like a bang, pop or fizz?

Maybe take pictures of the pc board & post them. Make sure they are well lit & clear...