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Post subject: Re: Did I kill my Tremolux?
Posted: Mon Oct 14, 2019 8:20 am
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"..And that's for both channels, so I doubt it's a pot issue...."
- StarcasterMax.

I not a pot issue.

Tubes 12AX7 , 12AT7 or ECC 81, ECC83 will work for the test, all are safe for the amp.


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Post subject: Re: Did I kill my Tremolux?
Posted: Mon Oct 14, 2019 8:24 am
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StarcasterMax wrote:



Another thing: spray contact cleaner on tube circuitry can cause damage (so seems to have happened to another of my amps...)

Wrong if you use the right product ; electronic contact cleaner

and I've been suggested "rectified gasoline" instead : have you ever heard about?

NOOOO don't use that. What is that ?


And again, thank to all of you for your contribution


Don't do if you are not sure what you are doing. Except if you want to kill your amp :lol:


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Post subject: Re: Did I kill my Tremolux?
Posted: Mon Oct 14, 2019 9:00 am
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StarcasterMax wrote:
...tube chart reads AA763 circuit

If that be the case then your amp cannot be a 1961 model.

Look for an ink-stamped date within the chassis, usually located on the inside and adjacent to the P/T and bias-supply board.

Arjay

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"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


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Post subject: Re: Did I kill my Tremolux?
Posted: Mon Oct 14, 2019 10:03 am
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stratele52 wrote:
Tubes 12AX7 , 12AT7 or ECC 81, ECC83 will work for the test, all are safe for the amp.

I tried a new 12AT7WC with no success...

stratele52 wrote:
StarcasterMax wrote:

and I've been suggested "rectified gasoline" instead : have you ever heard about?
NOOOO don't use that. What is that ?

A technician suggested that, he said that's what they use to clean electronics
He said contact cleaner can leave some residual that can cause a short
I still use contact cleaner, but only for the basic stuff as for cleaning pots
For the rest I DON'T touch anything anymore :wink:

Retroverbial wrote:
StarcasterMax wrote:
...tube chart reads AA763 circuit

If that be the case then your amp cannot be a 1961 model.
Look for an ink-stamped date within the chassis, usually located on the inside and adjacent to the P/T and bias-supply board. Arjay

I had suspected that....I had read somewhere that those circuits are more recent
Oh well, I don't mind...it's still a Tremolux
I've seen the stamp, it's 2 letters and 4 digits, isn't it? Something like AB7134...I'll double ceck
If I post a photo, would you be able to tell if there is anything anomalous/non-compliant with the circuit?
Thanks


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Post subject: Re: Did I kill my Tremolux?
Posted: Mon Oct 14, 2019 10:06 am
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StarcasterMax wrote:


If I post a photo, would you be able to tell if there is anything anomalous/non-compliant with the circuit?

Thanks


Yes,


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Post subject: Re: Did I kill my Tremolux?
Posted: Mon Oct 14, 2019 11:05 am
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StarcasterMax wrote:
If I post a photo, would you be able to tell if there is anything anomalous/non-compliant with the circuit?


A qualified "maybe".

Multiple chassis pics of high-res quality will provide the most usable intel for diagnosing the amp's issue(s). Use a public hosting service so we can all view them, as many as you can shoot. You'll find a rectangular "can" bolted to the top of the chassis, held fast by four screws -- carefully remove that cover and photograph everything within (it should be five cylindrical electrolytic caps and a couple of carbon-comp resistors). Don't forget to re-install the cover when done.

Arjay

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"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


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Post subject: Re: Did I kill my Tremolux?
Posted: Tue Oct 15, 2019 10:05 am
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Retroverbial wrote:
StarcasterMax wrote:
If I post a photo, would you be able to tell if there is anything anomalous/non-compliant with the circuit?

A qualified "maybe".
Multiple chassis pics of high-res quality will provide the most usable intel for diagnosing the amp's issue(s). Use a public hosting service so we can all view them, as many as you can shoot. You'll find a rectangular "can" bolted to the top of the chassis, held fast by four screws -- carefully remove that cover and photograph everything within (it should be five cylindrical electrolytic caps and a couple of carbon-comp resistors). Don't forget to re-install the cover when done.
Arjay

Sorry, I can't see the "can", nor the five cylindrical caps and don't even know what a carbon-comp resistor is... :oops:
I just pulled out the chassis from the amp head and everithing is visible right away
I thought I could upload images directly here from my pc
I'll try and find an hosting service (not used to this, may take a while)
You mean you could give a diagnosis on the amp just by lookin' at it? That'd be awesome!
I took pics with my phone camera, it says 13Megapixel res...don't know how good is that...I can read caps values in it, thou...
Cheers


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Post subject: Re: Did I kill my Tremolux?
Posted: Tue Oct 15, 2019 10:12 am
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StarcasterMax wrote:

You mean you could give a diagnosis on the amp just by lookin' at it? That'd be awesome!


I was definitely optimistic.
Retroverbial is right; maybe

Picture may help.
First don't loose your time do what I write: Clean all tubes and socket contacts.


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Post subject: Re: Did I kill my Tremolux?
Posted: Tue Oct 15, 2019 10:21 am
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StarcasterMax wrote:
Sorry, I can't see the "can", nor the five cylindrical caps and don't even know what a carbon-comp resistor is... :oops:


I'm done.

Have a nice whatever.

Arjay

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"Here's why reliability is job one: A great sounding amp that breaks down goes from being a favorite piece of gear to a useless piece of crap in less time than it takes to read this sentence." -- BRUCE ZINKY


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Post subject: Re: Did I kill my Tremolux?
Posted: Tue Oct 15, 2019 10:51 am
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StarcasterMax wrote:
Sorry, I can't see the "can", nor the five cylindrical caps and don't even know what a carbon-comp resistor is... :oops:

Arjay is referring to this "box":
Image
While this is a picture of a deluxe reverb, there will be a similar "box" on your Tremolux. Remove the 4 screws, and the cover and include pictures of under the cover.


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Post subject: Re: Did I kill my Tremolux?
Posted: Tue Oct 15, 2019 11:02 am
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Retroverbial wrote:
StarcasterMax wrote:
Sorry, I can't see the "can", nor the five cylindrical caps and don't even know what a carbon-comp resistor is... :oops:


I'm done.

Have a nice whatever.

Arjay

Sorry, Arjay, didn't mean to be rude or offensive....it's just that I was considering only the inner side of the chassis
Now that Vinyl showed me I feel even more embarassed
Of course I should have seen it
Thanks for your patience


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Post subject: Re: Did I kill my Tremolux?
Posted: Tue Oct 15, 2019 12:44 pm
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StarcasterMax wrote:
Sorry, Arjay, didn't mean to be rude or offensive....it's just that I was considering only the inner side of the chassis
Now that Vinyl showed me I feel even more embarassed
Of course I should have seen it
Thanks for your patience


I would say no one here including Arjay found your posts to be rude or offensive. I would also say there is no reason to be embarrassed.

Your English is very good, but that does not mean that you may not understand the difference between "rectangular can" and box".

We will do our best to help you, if we can.


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Post subject: Re: Did I kill my Tremolux?
Posted: Tue Oct 15, 2019 3:34 pm
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vinyl wrote:
[

I would say no one here including Arjay found your posts to be rude or offensive. I would also say there is no reason to be embarrassed.

We will do our best to help you, if we can.



You are 100 % right. :)


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Post subject: Re: Did I kill my Tremolux?
Posted: Wed Oct 16, 2019 4:16 am
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Thanks a lot for your understanding

stratele52Last night I sprayed the tubes contacts and sockets but still with no result...
Then I opened the infamous can and found the 5 caps and resistors
These are brand new as they've been replaced by the tech who serviced the amp short after I bought it
(I just had been wondering where he took the used caps he gave me back from, as I couldn't spot anything like that anywhere inside the amp!!... :lol:)
I uploaded some pics on a Google Photos album and here is a link to it
https://photos.app.goo.gl/yCsuwrw3QGZ32ecv9
I will add some more later (need sunlight for better pics quality...) if the link does work
Please let me know if the pics look messy all togheter and if better share them one by one
Cheers
Max


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Post subject: Re: Did I kill my Tremolux?
Posted: Wed Oct 16, 2019 4:58 am
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From your photos, the bypass and bias supply electrolytic caps have been replaced. The screen resistors have been replace with 5-watt wire-wound variety (this is also a good thing). The circuit appears to be an AA763. Like my Tremolux, which also lacks the 1k-ohm grid stopper resistors on the 6L6 signal grids --- unique to the AA763 circuit, IIRC.

http://ampwares.com/schematics/tremolux_aa763.pdf

Looks to be in very good shape. Here's some photos of my 1963 Blonde.

Image
Image
Image
Image
Image


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