SOLA SOUND / D*A*M: Goldie MKI Tone Bender

Someone mentioned this in the comments recently (thank you ClassicFuzz), so I thought I’d have a look at the photos on Reverb.  

The Goldie is a MKI in a MKII enclosure from March 2022, likely to be inspired by this unit found in Germany – which is an absolute train wreck of work.  

It looks a lot like a MKII board, it even has a cap to ground on the input – a full set of OC82 transistors is also more likely to be seen on a MKII.  That’s about where the differences end – a nice nod to a MKII, but it’s definitely a MKI.

This Goldie should not be confused with the other Goldie, which is a MK1.5 – confusing no?

SOLA SOUND / D*A*M GOLDIE MKI TONE BENDER – 0.15″ VERO LAYOUT

SOLA SOUND / D*A*M GOLDIE MKI TONE BENDER - 0.15" VERO LAYOUT

Apart from construction, the most obvious difference to a regular MKI is the cap to ground on the base of Q1 (the silver polystyrene cap).  I haven’t been able to spot the value anywhere – thought I could vaguely see an n3 on one, meaning that it might be a 3n3 or similar low-value cap.   D*A*M have used a 3n3 on the input of some MKIs in the past, so probably a safe bet that this is the same.  

I also haven’t put eyes on the value of the brown box cap, which is most likely 100n (standard value).  Same for the input cap, I’m assuming 10n as a standard value, but you never know.

Below is the version with the extra resistor in parallel with the 470k which would change the biasing of Q2.  It also appears to have a 47k resistor instead of a 56k resistor on the output.  47k vs 56k makes very little difference.  A slight change to the HPF that it forms with the 100n cap, but not much to worry about (34hz vs 28hz respectively).  There’s probably a similar range of variance just with normal component tolerances.

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