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Just a heads-up: My next shipping day will be Tuesday 19th Jan 2021 (I have to catch up on some admin etc!) Cheers, Phil
Modifications for Spectrum 128 variants
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1.65K Resistor - Toastrack AY-Beeper Balance Mod
When using a SCART lead with the Spectrum 128, the audio level of the AY sound chip is much lower than that of the beeper from the ULA. Replacing R115 (just left of the ULA) with a 1.65K resistor gives a more equal balance.
A 15uH inductor & 82pf Capacitor for Spectrum 128 and +2 Video mod
Spectrum 128 / +2s often have a yellow/cyan shadow in their RF and Composite video output. It is possible to reduce this effect by connecting a 15uH inductor and a 82pf capacitor in series and soldering them between pins 8 and 17 of the Spectrum 128 +2's TEA2000 video encoder chip.
470 Ohm resistor
Anti-Jailbar capacitors for Toastrack Spectrum 128
It has been found that replacing C7 and C8 with 1uf ceramic capacitors and the 22uf electrolytic cap at C28 with a 47uf version often reduces the jailbar effect on the "toastrack" Spectrum 128. This kit contains all three caps. More info can be found here.
3 Metres of flux-cored 60/40 tin-lead solder
Good quality, 0.7mm diameter - ideal for fine electronics work.
MuRata Switch Mode 5v Regulator for Spectrum 128 "Toast Rack"
A replacement for the cheap inefficient 7805 used in the Spectrum 128 "Toastrack". This high-efficiency switch mode regulator wastes very little power as heat so no heatsink connection is required. It mounts directly onto the PCB where the 7805-connector wires are soldered.