Amp issue fixed - now space rocket and speaker chat

soma1975 · May 2019

Just picked up a 5E3 clone for a fellow fretboarder which sounded great at his house.

I've driven it home and now it makes this noise. Basically a weird blooming underneath the notes. Same thing happens on every input.

Do we think it's an obvious tube knackered in transit jobby or is it something that needs looking at?

https://soundcloud.com/user-886084606/recording-3

Any suggestions gratefully received.

gringopig · May 2019

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ICBM · May 2019

Yes, most likely a microphonic power valve. Bear in mind that valves are often so sensitive to vibration via the chassis that even tapping on the other (not faulty) valve will make the noise, unless you hold the faulty one with a cloth.

Philtre · May 2019

ICBM said:

...unless you hold the faulty one with a cloth.

Pah, real men use their bare fingers.

soma1975 · May 2019

Thanks chaps. Damn my stupid sexy driving over speedbumps. So I should just buy a new matched pair I guess.

Jimbro66 · May 2019

Philtre said:

ICBM said:

...unless you hold the faulty one with a cloth.

Pah, real men use their bare fingers.

The trick, William Potter, is not minding that it hurts

munckee · May 2019

Blimey I've driven valve amps around a lot and never had this happen, did you pull an up on two wheels dukes of hazzard manouvere??

soma1975 · May 2019

I mean, I was in a rush to get home...

Also I live on an unadopted road and outside my house it often looks like a WW1 trench so possibly it got jostled there.

On the plus side, NAD for me and this one's only 14KG

ICBM · May 2019

munckee said:

Blimey I've driven valve amps around a lot and never had this happen, did you pull an up on two wheels dukes of hazzard manouvere??

It was almost certainly like it before, but something in the room the amp was in/is now in was suppressing/accentuating the vibration. The difference between the amp standing on carpet or a hard floor can be enough, or even the amount of natural reverb in the room - it can be really astonishingly sensitive.

gringopig · May 2019

.

soma1975 · May 2019

I had it on the back seat with a seat belt. just unlucky I guess.

kreggs · May 2019

Ahh thats crazy eh. What about the valves on the radios of lancaster bombers as they hurtle through relentless flack cannon fire. I guess they were more robust.

munckee · May 2019

gringopig said:

I was told by a tech that the best place for an amp in a car is the back seat with its own seatbelt on. Nice and damped by design. I transported a Champ 10 miles, switched it on and the 6V6 blew up. It was in the boot.

Amps in my car go behind the passenger seat with the seat adjusted to just enough space for the amp with cushion in front and cushion behind. Touch wood no problems so far.

soma1975 · May 2019

kreggs said:

Ahh thats crazy eh. What about the valves on the radios of lancaster bombers as they hurtle through relentless flack cannon fire. I guess they were more robust.

Don't make 'em like they used to mate.

soma1975 · May 2019

Glad to say a pair of Tung Sol 6V6GTs in there and the weird noise has disappeared. Many thanks all.

Now to swap out the speaker.

noisepolluter · May 2019

soma1975 said:

Glad to say a pair of Tung Sol 6V6GTs in there and the weird noise has disappeared. Many thanks all.

Now to swap out the speaker.

Celestion Blue?

markj · May 2019

noisepolluter said:

soma1975 said:

Glad to say a pair of Tung Sol 6V6GTs in there and the weird noise has disappeared. Many thanks all.

Now to swap out the speaker.

Celestion Blue?

Definitely got to be a Celestion Blue. My Gartone Bluesman sounds so sweet with one.

soma1975 · May 2019

Nope a WGS G12Q. Figured if they were good enough for Rift...

Wanted to go for a Weber 12a125a but seems they are impossible to get over here so will wait until yank family come over here.

ICBM · May 2019

kreggs said:

Ahh thats crazy eh. What about the valves on the radios of lancaster bombers as they hurtle through relentless flack cannon fire. I guess they were more robust.

Part of the standard equipment for the aircraft was a complete set of replacement valves - they came in a special compartmented box with all the types labelled on the liner. The wireless operator was responsible for maintenance in flight.

kreggs · May 2019

ICBM said:

kreggs said:

Ahh thats crazy eh. What about the valves on the radios of lancaster bombers as they hurtle through relentless flack cannon fire. I guess they were more robust.

Part of the standard equipment for the aircraft was a complete set of replacement valves - they came in a special compartmented box with all the types labelled on the liner. The wireless operator was responsible for maintenance in flight.

Wow thats really interesting. I imagine the same for the first moon/space missions too.

ICBM · May 2019

kreggs said:

I imagine the same for the first moon/space missions too.

The Apollo spacecraft were all-solid-state, I’m pretty sure. I don’t know about any of the earlier ones, but I would guess the first Russian missions at least were valve.

I know about the aircraft valve set boxes because I had one, by the way

. I’ve still got a couple of army field radio ones too (50s I think) although the valves are long gone and I use them for keeping parts in.

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Amp issue fixed - now space rocket and speaker chat

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