freestompboxes.org

I figured I'd toss this up here since I have one coming my way in a few days. It seems to have a mix of ICs and transistors.

Would be willing to bet that it's a Tubescreamer with a Timmy bass control and a bipolar supply from a 1044 or 7660.

Goop?
Ha.

mmolteratx wrote:Would be willing to bet that it's a Tubescreamer with a Timmy bass control and a bipolar supply from a 1044 or 7660.

The 3.3K resistor off the bass control appears to be similar. There a couple of other 3.3K resistors around the Opamp too. I'm just guessing but I can't see anything else beyond that as far as the Timmy goes.

I received my Mayflower today and played around with it for a little while....but couldn't resist checking out those chips. I might have set a degoop record. It took me less than 2 minutes to get the tiny bit of goop off the ICs. They are both RC4558P. Both the transistors are MPS A18.

Does anyone want any more pictures before I trade it away? It's not really grabbing my interest.

Will post some better ones in daylight but here are a couple with the cap values.

Better pics:

that translucent shot is great!

any chance you can do the same from the other side? at similar angle (hard when hand held I know but orth a crack)?

Here's the other side in the light.

Riveting design.

sonicmojo wrote:Here's the other side in the light.

onya.. thanks

Jack Deville wrote:Riveting design.

you sure? I mean.. you're the pro here but it looks like it's soldered to me...

I lol'd.

..... resistance values
thank to sonicmojo and we all go to the party schematic!
(there will be some mojo hidden in the jack?)

bump:

any schematic?

ALDOUSCROSS wrote:bump:

any schematic?

All information needed to draw a schematic is in this thread. Feel free to do so.

Just did a quick trace, though I don't know why I bothered. It's a Timmy wrapped with Tubescreamer buffer stages, with a voltage follower buffered Vref. There's one resistor I can't find a place for without better pics, but appears to be part of the second Timmy gain stage. Will upload once I clean it up and figure out what the hell that resistor is there for. Slightly tweaked tone controls (series resistor in the Timmy treble control altered to 5k6, bass control caps are 10n and 1u) and a lower value gain pot. That's it.

ALDOUSCROSS wrote:bump:

any schematic?

oh no, not you again!
isn't this the guy that refused to share some of his "great secret schematics and layouts" some time ago?

any MONEY!?

This is as much effort as this is gonna get from me. Anyone else wants to finish it and get an exact schem, be my guest.