Help identify this Dynacomp circuit

[TimH]

Can anyone tell me if this is the script logo circuit?

 

[TimH]

bump...anyone?

 

[TimH]

Beuler?

 

[Cpt. Picard]

I just cracked open my new one, it's nothin' like that!

 

[Kodawari]

I don't think they changed the circuit. The opamp on the early ones was a different casing, but the same circuit as far as I know. Do you have examples of different schematics for the script vs the block logo?

 

[TimH]

no I don't. I just know this is a late 70's or early 80's block logo...some of the early blocks are the same as the scripts but I'm not sure where the change happened or how to tell the difference. I'm hoping someone on here can help.

 

[hurleysurf]

I think that is the script logo circuit. I think the block logo has two resistors jumpered across most of the board. But I could have it backwards. Someone please conrrect me if I'm wrong.

 

[Cybercat]

Hi Tim,
Looks quite similar to mine : -

Got this one offer Mike Pierra (a.k.a. Analogman) about 11 or 12 years ago, & it already looked very old and beaten up then. It may have mods other than the 3P/3T switching as I recall him telling me something about it having been his working prototype (for what I guess later became the "DynaRoss"?), & not sure if he returned everything to original afterwards.

Anyway, it sounds stellar! Better than an early block logo I had, & even the original script I owned back in the 70s.

How does yours sound?

 

[scottywompas]

I thought that circuit looked pretty close but then I remembered a little something I read on the Dunlop website. The original script dynacomp had a metal can packaged ca3080.

http://www.jimdunlop.com/index.php?page=products/pip&id=387&pmh=products/p_and_e_detail

Then again, things changed a lot back in those days and they could have switched to the standard opamp while still maintaining the script logo.

Scott

 

[TimH]

Hi Tim,
Looks quite similar to mine : -

Got this one offer Mike Pierra (a.k.a. Analogman) about 11 or 12 years ago, & it already looked very old and beaten up then. It may have mods other than the 3P/3T switching as I recall him telling me something about it having been his working prototype (for what I guess later became the "DynaRoss"?), & not sure if he returned everything to original afterwards.

Anyway, it sounds stellar! Better than an early block logo I had, & even the original script I owned back in the 70s.

How does yours sound?

And yours is a script logo pedal?

 

[Cybercat]

And yours is a script logo pedal?

Erm, yes and no!
-- the top part of the casing is from a very early "block logo" (the bottom part was a different colour, off another pedal), but the board was supposed to be script logo - Though as I said above, I understand this had been used for experimentation, and some components may not have been put back to original.

Sorry for any confusion!

 

[gururyan]

Here is my '77, note the can.

 

[TimH]

so does the can vs IC effect the tone much?

 

[BMF Effects]

so does the can vs IC effect the tone much?

Not in my opinion.

 

[Z-Rider]

This thread got me curious, so I opened mine today and took these pics.
The block logo is a '78, the script a '76 according to the pot codes. Notice the script board with the 'r', 'c', 'd' and 'ic' markings.
There's no sound difference between the two and I use the block all the time for years, as can be seen.

Z.