#1
So I bought a new tube amp the other day and from what I can gather its 50w "based on the name" DESALVO ST-P50VR...

I was at band practice yesterday and I had to play with it with all levels on 10 for it to be heard properly, also when I played with the master over about 6 it made a high pitched noise when I wasn't playing.

Its not suppost to be this quite, i've had a 50w tube amp before that was much louder than this.

Do the tubes need replacing>

Thanks
Sean

Guitars:
Fender American Standard Strat 2009 Limited Edition
Ibanez Gak30

Amps
Jcm 800 2203 '82

Pedals:
John bull jr overdrive
Boss Equalizer GE-7
Boss TU-3
Boss CH1

My Band
http://www.myspace.com/hereliesnuggetband
Last edited by sean1784 at Mar 23, 2011,
#2
borrow an isp decimator to kill the high pitched sound and yes you need new toobz
#4
I dont know what you mean. If you amp is quite, quite what? Quite interesting sounding? Quite dapper? Quite lovely sounding Quite dyslexic?

Please explain.
#5
Sorry I meant quiet...

When I was at practice last night I had to run all the levels at close to ten to be heard....

Guitars:
Fender American Standard Strat 2009 Limited Edition
Ibanez Gak30

Amps
Jcm 800 2203 '82

Pedals:
John bull jr overdrive
Boss Equalizer GE-7
Boss TU-3
Boss CH1

My Band
http://www.myspace.com/hereliesnuggetband
#7
Quote by sean1784
If I replace the tubes will it mean that the amp will be louder?

If the tubes were bad to begin with, it will definately be louder.

I for the life of me can't find any good info about that particular amplifier, though.
EDIT: Yeah, as the guy above me said, check the speaker too.
Ceci n'est pas une signature.
#9
can't see it being the speaker. but maybe i guess...


are you sure it's not 5 watts?

what kind of tubes is it running and how many?
I wondered why the frisbee was getting bigger, then it hit me.
#10
How can I check the speaker to make sure its fine?

The tubes in it are..

2 el34's
3 12ax7
1 bh7



ill get a photo of the tubes when its warmed up later as im not at home..

Guitars:
Fender American Standard Strat 2009 Limited Edition
Ibanez Gak30

Amps
Jcm 800 2203 '82

Pedals:
John bull jr overdrive
Boss Equalizer GE-7
Boss TU-3
Boss CH1

My Band
http://www.myspace.com/hereliesnuggetband
#11
ok yea, that's no 5 watter.

it sounds like borked power tubes to me. i'd get a matched set of EL34s in there. 90% that's the issue. if it's not, you have a set of back up power tubes which is always a good idea anyway, they don't last forever. (longer than people think, but none will last forever).
I wondered why the frisbee was getting bigger, then it hit me.
#12
Haha I was gonna say i've never seen a 5w with that many tubes

So which ones need replacing the el34's?

Ill take a picture when I get home when its warmed up and post it back here if thats any help.

Thats gonna be about 10 at the latest.

How much will it cost to get it retubed or can I do it my self? Although will I need to bias it and such?

Guitars:
Fender American Standard Strat 2009 Limited Edition
Ibanez Gak30

Amps
Jcm 800 2203 '82

Pedals:
John bull jr overdrive
Boss Equalizer GE-7
Boss TU-3
Boss CH1

My Band
http://www.myspace.com/hereliesnuggetband
#13
yea the 34s. it looks like you have external bias test points and adjustment screws right there on the back panel. that should make biasing easy.

i got one of these for like $15 at walmart.


works great. there are plenty of good tutorials out there on youtube etc on how to do it.
I wondered why the frisbee was getting bigger, then it hit me.
#14
ill have to have a look around for one and a couple of tutorial's.

What tubes would you recamend?

Guitars:
Fender American Standard Strat 2009 Limited Edition
Ibanez Gak30

Amps
Jcm 800 2203 '82

Pedals:
John bull jr overdrive
Boss Equalizer GE-7
Boss TU-3
Boss CH1

My Band
http://www.myspace.com/hereliesnuggetband
#15
Quote by sean1784
ill have to have a look around for one and a couple of tutorial's.

What tubes would you recamend?

i personally use Electro Harmonix EL34s, but JJs are good too.

i had an old set of mullards and the EH's sounded very close to them, a tad brighter but hardly noticable to my ears.

then again i sat 3rd row for a couple WHO concerts back in the early 90s so my hearing may be tarnished.
I wondered why the frisbee was getting bigger, then it hit me.
#16
2 EL34's mean anywhere from 30 to 60 watts output. It would be worth changing the preamp valves too, they're just plug'n'play, they're cheaper too :-)
#17
The electo harmoics are what are in it now. and they sound quite good,

Ill have a look around

Guitars:
Fender American Standard Strat 2009 Limited Edition
Ibanez Gak30

Amps
Jcm 800 2203 '82

Pedals:
John bull jr overdrive
Boss Equalizer GE-7
Boss TU-3
Boss CH1

My Band
http://www.myspace.com/hereliesnuggetband
#18
JJ's are a bit darker and have more bite to them, I've always felt like.

Electro Harmonix does do the EL34 right, though. Love their 34s.
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