tube amp problem... help!

[Meio]

hi! i own a vox valvetronix ad50vt-xl na tube amp. ive been using this amp for a year pa lang and its already started making this horrible digital squeal/squeak na nakakarindi at high volume.

i have a feeling na the tubes needs replacing na. please clarify?   

and if ever san ba nakakabili ng amp parts dito sa pinas?   

[Chito]

Don't mean to disappoint you but the valvetronix amps are not exactly tube amps but rather a hybrid, in essence, a solid state amp that has a 12ax7 somewhere in the circuit.

Here is an explanation "the Valvetronix amps use a 12AX7 tube (commonly used as a preamp tube in a tube amp) run at the correct specified plate and heater voltages, then coupled it with an actual output transformer prior to sending the final signal to a solid-state amplifier".

I guess that doesn't answer why you're amp is making all that noise. I suggest bringing it to an amp tech. I honestly don't think replacing that single 12ax7 is going to make the noise go away.

[Meio]

Thanks for the insight, sir!

I have absolutely no idea on what to do with this and the amp's virtually unusable at anything past 12 o' clock volume. I will probably bring this to a tech this weekend for diagnosis... 

[BAMF]

Thanks for the insight, sir!

I have absolutely no idea on what to do with this and the amp's virtually unusable at anything past 12 o' clock volume. I will probably bring this to a tech this weekend for diagnosis... 

Ummm. I repaired a Marshall Valvestate with exactly that symptom. I just replaced the 12ax7 which was already microphonic. Problem solved.

[colorless krayola]

Buy a new one. At my signature. JK 

Bring it to him (BAMF).
If that 12ax7 is already microphonic as BAMF says, then it will make feedbacks.

[stringman]

If you know how to DIY, you can get Chinese made tubes at Deeco Raon it's around 150 bucks I think. Won't cost you much to make that test.

[siore]

If you know how to DIY, you can get Chinese made tubes at Deeco Raon it's around 150 bucks I think. Won't cost you much to make that test.

P300 for the national brand 12ax7.  But that tube distorts rather easily, I'm not sure if that's a good match for the 12ax7 it's replacing.  Audiophile also has some pre-amp tubes, as well as kinetic audio in robinsons pioneer.  Suggest you go to both and shop for tubes, bili ka na rin ng spares mo.

[pitongjerome]

If you know how to DIY, you can get Chinese made tubes at Deeco Raon it's around 150 bucks I think. Won't cost you much to make that test.

300 po ang nationals sa deeco.. unless may iba pang brand dun?