Pinnacle problem

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mislav.vg
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Post by mislav.vg »

I built wampler pinnacle using this schematic:
Image

But I have one problem...
When the tone knob is turned to the right it sounds normal, graphicaly like this:
Image

But when tone knob is in the middle or left positions (more bass) it behaves like this:
Image
So when i hit a string, it takes about a second to reach normal volume.

Any ideas how to fix this?

Thanks

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NickS
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Post by NickS »

Sounds like some sort of mis-biassing problem, but the only device that should be affected by the tone control is the last FET. The tone control woulld be varying the gate resistance to earth through 220k+10k+10k+tone+82K in parallel with 470k; do you have a meter so you can see if the voltage on the FET's source varies as you move the tone control?

Can you post clear close-ups of your build so that we can check the layout? Also details of which FETs you used/pinout?

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mislav.vg
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Post by mislav.vg »

it was problem with biasing, i lowered last two fets drain resistors and it works fine now!

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lutor
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Post by lutor »

My personal layout not verified,but in use for build fx.
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pinnacle.gif

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lutor
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Post by lutor »

Same but,for perfboard use.
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pinnacle_perf.gif

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Post by caspercody »

has anyone built this one? Can anyone verify if it is the Pinnacle?

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Post by caspercody »

Okay I made this, and it is very close to the Pinnacle. Not sure what version Pinnacle. I did remove the boost resistors, because I was getting a lot of noise. Otherwise built it per schematic.

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Post by lutor »

I have Build and verified. Only modification on the part that regards the boost. Great sound!

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Post by caspercody »

Do you think it sounds like the Pinnacle?

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lutor
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Post by lutor »

I do not know how much equal one I can be to the Pinnacle, because I cannot make a comparison direct. I can imagine the likeness through the sample found online. I am but sure that it has an optimal one of brown sound distortion and not only that one. Certainly he will construct it to who will have much satisfaction.

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Post by theItalianDiYer »

can u post your pcb?? i am very courious to try it!!

thanks

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Post by caspercody »

You can use the BSIAB2 pcb, and make the changes in the grayed out areas from the schematic shown. The only thing that would not be on the pcb is the grayed area after the tonestack. This is the twin t filter, and a Jfet recovery stage.

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Post by indyguitarist »

mislav.vg wrote:I built wampler pinnacle using this schematic:
Image

But I have one problem...
When the tone knob is turned to the right it sounds normal, graphicaly like this:
Image

But when tone knob is in the middle or left positions (more bass) it behaves like this:
Image
So when i hit a string, it takes about a second to reach normal volume.

Any ideas how to fix this?

Thanks
oddly enough this is the first time I looked at this schem much.... this circuit isn't correct past the gain stages, quite a bit different actually.
It's also from a version that's about 3 or 4 years old. The newest ones are quite a bit different.

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Post by lovetone »

indyguitarist wrote:
mislav.vg wrote:I built wampler pinnacle using this schematic:
Image

But I have one problem...
When the tone knob is turned to the right it sounds normal, graphicaly like this:
Image

But when tone knob is in the middle or left positions (more bass) it behaves like this:
Image
So when i hit a string, it takes about a second to reach normal volume.

Any ideas how to fix this?

Thanks
oddly enough this is the first time I looked at this schem much.... this circuit isn't correct past the gain stages, quite a bit different actually.
It's also from a version that's about 3 or 4 years old. The newest ones are quite a bit different.
Do you have the correction for the schematic after the first gain stage? or a full schematic?

Cheers

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Post by ct88 »

u will need a input and output buffer to come across the actual version :roll:

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Post by lovetone »

ct88 wrote:u will need a input and output buffer to come across the actual version :roll:

Do you have a schematic with the correct information?

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Post by ct88 »

nope, i only built a circuit similar to that one (changed some values to my tastes :)) where i removed the last buffer and insered 2 buffers made by IC :wink:

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Post by lovetone »

ct88 wrote:nope, i only built a circuit similar to that one (changed some values to my tastes :)) where i removed the last buffer and insered 2 buffers made by IC :wink:

O.K. Thanks

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Post by joeboo88 »

I built the pinnacle according to lutors perf layout,last night, and it fired up first time.
sounds awesome, no noise from the boost section, its sound very close the real thing, to me anyhoo.
thanks again Lutor :mrgreen:
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Post by lutor »

I have felt some person that he has used mine layout for the build and has had a broblem of feedback or/and hiss. If someone other person has the same problem and wants to resolve, is necessary replace the R-3 (of mine layout) with a low value resistor. To go down step by step till to find the value of the resistor that eliminates the problem. I task that can be arrived till value of 100K.
Best regards.

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