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Post subject: Blues Junior Tube Board Replacements
Posted: Fri Jun 20, 2014 9:56 pm
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Hello everybody, this is my first post here. I've been playing Fender Amps for my whole life and have been fixing them for almost as long.

I've had a great customer bring back the same Blues Junior amp over and over because the power tubes are oscillating, the tube sockets connections to the PCB are intermittent, it is blowing tubes, etc. Recently, I decided to take a proactive approach and manufacture a small test batch of new tube socket PCB's for the black Fender Blues Junior. These are much better than the original and feature FR4, plated through holes, double sided 1oz copper thickness, filament winding off of the board, ceramic tube sockets, wider traces, and better routing. All you have to do is unsolder the ribbons from the old board, put the hardware on the new board, resolder the ribbons and filaments and you're done.

The noise floor on our test amp went way down because of the wound filaments and better routing. This board solves the majority of problems that Blues Juniors usually have.

If anybody is interested or has comments, suggestions, etc., I'm all ears.


Last edited by MikeSynthesizer on Sat Jun 21, 2014 7:57 am, edited 1 time in total.

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Post subject: Re: Blues Junior Tube Board Replacements
Posted: Sat Jun 21, 2014 1:22 am
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Same amp many time....... :(

Circuit board amp are fragile , you can't make too much mistake . You must fix them right first time. Too much try and error may damage the board.


Tubes blowing are not a mistery

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Post subject: Re: Blues Junior Tube Board Replacements
Posted: Sat Jun 21, 2014 8:36 am
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Sounds cool. What do you mean by "wound filaments off of the board"? Are you referring to tube filaments? This amp doesn't use tubes with filaments, they are heaters, the Cathodes are indirectly heated. :?:

I agree with stratele52, no reason that you can't fix intermittent tube socket connections instead of replacing the whole board. :idea:

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Post subject: Re: Blues Junior Tube Board Replacements
Posted: Sat Jun 21, 2014 12:00 pm
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shimmilou wrote:
Sounds cool. What do you mean by "wound filaments off of the board"? Are you referring to tube filaments? This amp doesn't use tubes with filaments, they are heaters, the Cathodes are indirectly heated. :?:

Too many "works" on the amp , circuits board copper broken ??

I agree with stratele52, no reason that you can't fix intermittent tube socket connections instead of replacing the whole board.
1-We don't know what is your experience, qualified or not too much .
2- Cheaper than a new board for the customer



:idea:

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Post subject: Re: Blues Junior Tube Board Replacements
Posted: Sat Jun 21, 2014 1:11 pm
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stratele52,

Thanks for the response and you're right about the nomenclature. I was referring to the heater supply. Instead of supplying the heaters with current via traces, I designed the board with wound jumper connections from tube to tube. Winding the connections from tube to tube cancels out fields and ultimately reduces noise and interference.

My experience is that I've been designing PCB's for a few years now. I made one for a customer and it turned out great. I figured I'd post the results here and see what happens.

I have been fixing broken solder joints and tube socket pads on these amps for years and some of them look pretty bad now.. Hence the need for an upgrade.

Image


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Post subject: Re: Blues Junior Tube Board Replacements
Posted: Sat Jun 21, 2014 1:14 pm
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Plated through holes are far more durable than single sided board connections. Manufacturing them isn't very expensive either. I think that it will be easier to replace than fix at this point for some amps out there.


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Post subject: Re: Blues Junior Tube Board Replacements
Posted: Sat Jun 21, 2014 1:15 pm
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New board will cost ( IMO ) the same price as good second hand Blues Junior amp.

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Post subject: Re: Blues Junior Tube Board Replacements
Posted: Sat Jun 21, 2014 1:16 pm
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Really, I plan on selling them for $40


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Post subject: Re: Blues Junior Tube Board Replacements
Posted: Sat Jun 21, 2014 1:21 pm
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MikeSynthesizer wrote:
Really, I plan on selling them for $40



Oh I did not understand you will built new board for sale .

I thought you want to buy a complete new board from Fender to replace the broken one . And this cost a lot $$$

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Post subject: Re: Blues Junior Tube Board Replacements
Posted: Sat Jun 21, 2014 9:01 pm
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Thanks for the explanation MikeSynthesizer. :)

Looks like very nice work. 8)

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