The great "I'd like to see the guts of" thread

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.
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J0K3RX
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Post by J0K3RX »

temol wrote: G4 review.

T.
I have to agree with Ola on Republican... I like the G3 better personally but the G4 is a close second. The gut shots look very easily traceable.. I wish that dude that took the pics would have gone a couple steps further and bent the pots up to see the board.. Oh well, at least we know it would be an easy trace if somebody happens to acquire one.

I have plenty of high gain preamps to work on already thanks to you and Val! Great work man!!

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Post by temol »

I like both G's, and Apex too. And I hope we'll see those pedals traced, some day.
I wonder what's the purpose of the two TL72s on G3 pcb. Input/output buffers, power supply, tone section? There is also Q6 visible. Is it a mixed circuit op-amps and transistors...?
I have plenty of high gain preamps to work on already thanks to you and Val! Great work man!!
:) thanks!

T.

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Post by J0K3RX »

I found this picture from pedal authority which gives a peak under the pots. I wonder how many other pics he took that didn't get posted in the review?
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Post by temol »

Even more ICs. I was expecting to see more transistors :)



T.

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Post by J0K3RX »

temol wrote:Even more ICs. I was expecting to see more transistors :)



T.
My guess is they are probably damn near the same circuit with some minor component value differences..

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Post by FloPoeKo »

Vermuram/Ibanez VTS808 anyone?


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Post by Cub »

A Timmy with a single tone control?
What will they think of next! :wink:
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Post by Cub »

Alright, that was disrespectful / unfunny / lame, take your pick. :(
I regret making the above post already, but there's no edit/remove button any more?
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Post by FloPoeKo »

Cub wrote:Alright, that was disrespectful / unfunny / lame, take your pick. :(
I regret making the above post already, but there's no edit/remove button any more?
No worries man, we all have that day... :horsey:

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Post by J0K3RX »

Lo and Behold... Asketh and The Bugg giveth unto the weary metal heads searching in vain :twisted:
https://www.pedalpcb.com/product/sanguinedistortion/

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Post by temol »

This I did not expect :)
There's also Fortin33, but no schematic at the moment.

T.

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Post by Cub »

FloPoeKo wrote:Vermuram/Ibanez VTS808 anyone?
There's some information here.
https://www.gearnews.com/namm-2019-iban ... on-tsv808/
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Post by caspercody »

Pedal PCB also mentioned they were doing the Revv G3.

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Post by temol »

caspercody wrote:Pedal PCB also mentioned they were doing the Revv G3.
And here it is

T.

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Post by okgb »

Vermuram/Ibanez VTS808 , I thought it sounded pretty good! I'll search around and see if I can afford one!

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Post by J0K3RX »

temol wrote:
caspercody wrote:Pedal PCB also mentioned they were doing the Revv G3.
And here it is

T.

I noticed there are a couple FET in one of the gut shots for the G3. One is directly off the wiper of the volume pot and the other you can barely see under the gain pot. Maybe for muting?

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Post by Manfred »

Something must have gone wrong, the switch SW1.2 effect nothing.
TyrianDetail.jpg

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Post by temol »

It's a DPDT (SW1.1 and SW1.2) on/off/on switch. So in a middle position C7 is disconnected.

T.

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Post by bugg »

J0K3RX wrote:I noticed there are a couple FET in one of the gut shots for the G3. One is directly off the wiper of the volume pot and the other you can barely see under the gain pot. Maybe for muting?
Those are SOT23 dual diodes packs.

There is a BJT bypass mute circuit that wasn't included in the Tyrian or Sanguine circuits.

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Post by Manfred »

temol wrote:It's a DPDT (SW1.1 and SW1.2) on/off/on switch. So in a middle position C7 is disconnected.

T.
In that cases, in each ON positions the capacitor C7 is connected in parallel to the capacitor C6 on in the same manner,
the resulting capacitance is the still the same.

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