Keeley Rat mods

A forum devoted to mod, tips and suggestions for upgrading and rehousing your VERY CHEAP commercial stompbox to near boutique excellence.
Post Reply
User avatar
tonymcbony
Breadboard Brother
Information
Posts: 140
Joined: 25 Aug 2008, 13:08
Has thanked: 22 times
Been thanked: 18 times

Post by tonymcbony »

F79A69B0-0EC8-4C1E-B55E-4936468C24D0.jpeg
I had measured all these but my daughter in a fit of creativity drew pencil all over my original schematic – do these numbers check out?

Edit: R8 had a strange value, removed from schem
Last edited by tonymcbony on 01 Sep 2022, 11:29, edited 2 times in total.

User avatar
Ichabod_Crane
Resistor Ronker
Information
Posts: 354
Joined: 26 Apr 2016, 15:11
Has thanked: 83 times
Been thanked: 36 times

Post by Ichabod_Crane »

Is R8 1.6k?

User avatar
tonymcbony
Breadboard Brother
Information
Posts: 140
Joined: 25 Aug 2008, 13:08
Has thanked: 22 times
Been thanked: 18 times

Post by tonymcbony »

Apparently, according to initial scratchings.

That one and c7 seem a bit off

User avatar
bajaman
Old Solderhand
Information
Posts: 4549
Joined: 26 Jun 2007, 21:18
Location: New Brighton, Christchurch, NZ
Has thanked: 595 times
Been thanked: 2058 times

Post by bajaman »

1.6k - NO
be kind to all animals - especially human beings

User avatar
bmxguitarsbmx
Cap Cooler
Information
Posts: 510
Joined: 25 Mar 2010, 21:15
Has thanked: 704 times
Been thanked: 216 times

Post by bmxguitarsbmx »

Is there a lot of clipping happening in the jet buffer? Biased as it is, it wouldn't have the most headroom. I must admit to only ever playing a Rat once.

I used to know a young "anarcho-communist" couple that worked at Proco in Kalamazoo. When they quit, they "liberated" a few thousand feet of instrument cable and all the connectors to make cables for the rest of time. It was weird because they always talked about how much they liked working there.

User avatar
tonymcbony
Breadboard Brother
Information
Posts: 140
Joined: 25 Aug 2008, 13:08
Has thanked: 22 times
Been thanked: 18 times

Post by tonymcbony »

Would switching 10k to 1k increase overall output of the pedal, or just clip more?

User avatar
tonymcbony
Breadboard Brother
Information
Posts: 140
Joined: 25 Aug 2008, 13:08
Has thanked: 22 times
Been thanked: 18 times

Post by tonymcbony »

bajaman wrote: 31 Aug 2022, 08:341.6k - NO
Have updated :thumbsup

User avatar
plush
Cap Cooler
Information
Posts: 641
Joined: 08 Dec 2015, 09:29
Location: Moscow, Evil Russia
Has thanked: 36 times
Been thanked: 172 times

Post by plush »

R1 = 1K -> Definitely NO.

User avatar
tonymcbony
Breadboard Brother
Information
Posts: 140
Joined: 25 Aug 2008, 13:08
Has thanked: 22 times
Been thanked: 18 times

Post by tonymcbony »

plush wrote: 01 Sep 2022, 10:13 R1 = 1K -> Definitely NO.
:oops:

Have tidied initial schem up to take erroneous values out

User avatar
tonymcbony
Breadboard Brother
Information
Posts: 140
Joined: 25 Aug 2008, 13:08
Has thanked: 22 times
Been thanked: 18 times

Post by tonymcbony »

So I’ve done the mods that are listed in that schem now (didn’t touch the erroneous 1M resistor ones but they’ve been edited out of schem now)

It’s got a lot more bass and a LOT more gain - it sounds better but loses the lower gain settings a bit.

Will be trying to tinker with the R4/C6 to trim it out a little

User avatar
Cub
Cap Cooler
Information
Posts: 458
Joined: 29 Aug 2011, 07:14
Location: The Netherlands
Has thanked: 102 times
Been thanked: 118 times

Post by Cub »

Hi Tony, how did the tinkering go ?
I wish I were a chestnut tree, nourished by the sun.
With twigs and leaves and branches and conkers by the ton.

Post Reply