Help! Fried my ST70

 I took my ST70 round to a mates house. When I reinstalled it I must have accidentally nudged the on/off switch to ON   . When I powered it up I heard a groan from somewhere within the amp and and none of the valves lit up.       
I've taken a look at the fuse and, unfortunately, it seems fine so I've obviously caused something more expensive to go pop. Where should I start looking and how deep will I have to dig into my wallet to put it right?

did you smell anything 'burnt' at all? Are there any obvious signs that a component has overheated?
Do a good overall visual check of all wiring under the chassis, have you got a multi meter handy? Check to see if you got any filament voltage from the main transformer.

Hi Vanity,

 I don't really know what you meant by "I've taken a look at the fuse". If you mean that literally, it might not be a good enough procedure. Sometimes they can blow and the visible part can still look good. Check it with an ohmmeter, or maybe you can flick the glass and look at the wire to see any vibrations.

 I'm certainly no expert (or even novice), but I don't think the fact of plugging it in with the power switch on would be any different than just turning it on with the switch. My guess would be that when the amp was plugged in, the preamp's volume control was not turned all the way down. This could result in blowing the rectifier tube (ask me how I know).

I hope you will get your ST70 up and running soon.

I hope this helps, but I posted in the hope the knowledgeable types found here will grade my answer.

fswidecki wrote:Hi Vanity,

 I don't really know what you meant by "I've taken a look at the fuse". If you mean that literally, it might not be a good enough procedure. Sometimes they can blow and the visible part can still look good. Check it with an ohmmeter, or maybe you can flick the glass and look at the wire to see any vibrations.

 I'm certainly no expert (or even novice), but I don't think the fact of plugging it in with the power switch on would be any different than just turning it on with the switch. My guess would be that when the amp was plugged in, the preamp's volume control was not turned all the way down. This could result in blowing the rectifier tube (ask me how I know).

I hope you will get your ST70 up and running soon.

I hope this helps, but I posted in the hope the knowledgeable types found here will grade my answer.

good point about the fuse, check it with a meter, can't really tell sometimes with fuses just by looking at them.

on a totally separate note, since when do we have these annoying ads on these pages, the one I get up blocks half the message and I cannot seem to delete it!

I don't have a problem with ads, I do have a problem when they block part of the messages.
fswidecki, I will try that, thanks.

They did on Safari too, but are now back at the top where they should be, not over the top of posts.

All this talk about adds blocking the topic seem to be blocking the topic ...   

Back to which ...

Were there no speakers connected when you powered it up? Das verbotin on tube gear, and can cause some serious damage. Just start backtracking looking for burn marks or bulges and hope it's not the big iron ...

And no ... I don't have any ad issues here using Chrome ...

sooooooo....has this been solved??

As a newb here;
 
I was wondering what the OP did wrong that caused this issue? (So I don't do the same)
He turned the switch on, and fried it...? Or, did it just happened to fry at his friend's house??
From his wording, it seems to imply that something procedural was done incorrectly?

MontanaWay wrote:sooooooo....has this been solved??

What ... the popup ad problem?    

If you throw an Idahoan and a Montanan off the top of a building at the same time, who hits the ground first?
The Idahoan, because the Montanan gets lost.
That annoying Milky Way ad has learned its manners, at least in Firefox and Chromium.

deepee99 wrote:If you throw an Idahoan and a Montanan off the top of a building at the same time, who hits the ground first?
The Idahoan, because the Montanan gets lost.
That annoying Milky Way ad has learned its manners, at least in Firefox and Chromium.

waddaya mean we get lost.......um....where am I again?????

MontanaWay wrote:

deepee99 wrote:If you throw an Idahoan and a Montanan off the top of a building at the same time, who hits the ground first?
The Idahoan, because the Montanan gets lost.
That annoying Milky Way ad has learned its manners, at least in Firefox and Chromium.

waddaya mean we get lost.......um....where am I again?????

You're just a bit west of Idaho, and slightly above the Arctic Circle, I think . . .

deepee99 wrote:

MontanaWay wrote:

deepee99 wrote:If you throw an Idahoan and a Montanan off the top of a building at the same time, who hits the ground first?
The Idahoan, because the Montanan gets lost.
That annoying Milky Way ad has learned its manners, at least in Firefox and Chromium.

waddaya mean we get lost.......um....where am I again?????

You're just a bit west of Idaho, and slightly above the Arctic Circle, I think . . .

DAMN!..........need to get a better GPS!!

Guys,

What ads are you talking about???

Recently, all I see is a little empty white box!  Maybe someone can fix the internet so I can get my nice comfortable ads back?  NOT!

anbitet66 wrote:Guys,

What ads are you talking about???

Recently, all I see is a little empty white box!  Maybe someone can fix the internet so I can get my nice comfortable ads back?  NOT!

Fix the Internet? Only Skizo is capable of a venture this vast. But I worry about him, his design plans for the R-3350 VTA radial turbo compound amplifier are hopelessly behind schedule. This is the beta version:
http://vimeo.com/36975300
Maybe the exhaust gas got the best of him. Inquiring minds want to know . . .

so I guess we never have found out if the op has fixed his problem........

MontanaWay wrote:so I guess we never have found out if the op has fixed his problem........

It it too early to guess, or will this remain one of life's mysteries?