THUNDERFUNK 750-A

Tube or solid-state, this section goes to eleven!
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chicago_mike
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Post by chicago_mike »

:horsey:

This is the new standard in quality bass amplification. The thunderfunk 750-A is based off of the origional AMP BH420 , Gibson GB440 amplifiers from the 80's and 90's. In fact, if you look at the amplifier board, it is IDENTICAL to Gibsons' Gb440, and later EDEN bass amplifiers. Since they use the same Sanken 2SC3264 and 2SA1295 Output transistors. Earlier models used the 2SC3858 and its counterpart.

The pictures in this first batch are dumbed down a little much. I can never tell what is a good file size / image size to post here. I have the origional shots and am still taking more as I go along.

WHAT I DO NOT HAVE
1. clear single shot of bottom pcb traces of preamp board -- I had to take multiple shots for it
2. clear shots of a couple components off the power supply pcb -- I have most everything
3. clear shots of a couple components off the output pcb -- I have most everything

WHAT I WANT / NEED HELP WITH
1. PCB trace for etching of power supply
2. PCB trace for etching of output ( power amp module )
3. PCB trace of both sides of preamp PCB ---- I do have a clear color photo of the top side with no parts on it. in a PDF.

Some nice features of the amp:
1. Practically no ceramic or electrlytic caps in the audio chain. Although there are a lot of green meanies!
2. High output power and CLEAN high output power down to 2 ohms
3. Easily obtainable parts..and an easy to follow layout.
4. Aural enhancer / Tonal balance(timbre) controls....which are exactly what you think they are. :wink:
5. Semi-Parametric eq...NOBODY ever gets this right.....It is SWEEPABLE. Any Definition of Parametric, means that you can change the Q as well. But the EQ in this amp is really nice anyways.

THE SWITCH
what is this feature?

It is simply a dpdt switch that switches between 2 different power supply chains for the preamp. One high voltage and one low voltage. I am in the process of gathering ALL the required pics of this. It actually does change the feel of the amp.

I have schematics but they do not include the switch feature...so we are on our own with that.

So.....Can I get some help? :D :horsey:

THE CHALLENGE IS ON![/color]
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Post by chicago_mike »

The first Salvo! :horsey:
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Post by chicago_mike »

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POWER SUPPLY PCB[/color]
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Post by chicago_mike »

power supply continued
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Post by chicago_mike »

OUTPUT[/b]
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Post by chicago_mike »

OUTPUT CONTINUED
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Post by chicago_mike »

AGAIN I APOLOGIZE FOR SOME OF THE BLURRINESS..I DONT KNOW WHAT FILE FORMAT OR IMAGE SETTINGS TO REALLY USE[/color]


NOW ONTO THE PREAMP :horsey:
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Post by chicago_mike »

UNDERSIDE OF PREAMP

FUZZY BUT MAYBE THESE WILL STILL WORK???
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Post by chicago_mike »

COMPONENT SIDE...
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Post by chicago_mike »

a coouple pics before I pass out....

It was hot playing the chicago blues fest today!!!
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Post by chicago_mike »

8)
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Post by chicago_mike »

:)
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Post by chicago_mike »

:D
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Post by chicago_mike »

:D
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Post by chicago_mike »

What file should I use??

gif, Jpeg?
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Post by chicago_mike »

:D
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Post by Prostheta »

Perhaps a silly question, but why the mix of 072s and a 5532? What makes one preferable to the other in this circuit?
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Post by ~arph »

chicago_mike wrote:What file should I use??

gif, Jpeg?
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Post by Prostheta »

PCX :slap:
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Post by Prostheta »

I just stitched both images together and lined them up with a bit of alteration to contrast the traces a little better. Dark, but easy to track around. What are the dimensions of this board, width and length? If all of these parts are readily available I would be interested in making one for a laugh. Perhaps even getting it redrawn in EAGLE or whatever?
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