Hey guys.
As usual, sorry for being quiet for so-fucking-long. I am already home from China for few days, so let's get to business:
-Rune's Shredmaster had some design flaws as he already had described - coming mainly from the second EQ (I made a stupid mistake when connecting a bypassing switch). Also, some mods that Rune's GP specialist tech suggested, but had not specified exact values are probably making problems. however:
-professional PCBs have been ordered and based on tracking information they left China at 16.6. Should be here any day now. Much less cables inside.
-second EQ has been modified with op-amplifier, adjusting levels back to 0dB after changing tone. The Marshall EQ is passive, therefore there is always some loss.
-second EQ is now fully bypassable, if you flip the switch, the circuit will behave like it is not even there.
-ALL the mods are switchable - that means, if you want fully modded GP, you will get a unit that is fully modded, but if you open the covers and switch some jumpers to OFF positions, you are back to stock GP. (also useful when finding out what exactly does each mod to the sound)
-I have new transformers for the GP, custom made to match original specs exactly. Low noise, low heat, exact voltages.
-I made a deal with one courier/packing company, that also provides boxes and stuffing for shipping. They guarantee that the unit will arrive in mint condition. (Rune's unit had seen some bouncing during transport, partially because I had to cram it into a box that should be bigger.. dammit)
-And for the pots - Original GP has all linear pots, I have used LOGs on the prototypes, because we often test the units during evenings and such, so better control of the lower volume is important. These pots don't change the sound of the unit - LOG pot on 12 o'çlock usually has around 20% volume, while linear is already on 50%. Therefore it seems, that the unit is not loud enough - if you are used to playing on 2 o'clock volume with linears, on logs you have to go somewhere between 4-5 o'clock. However, as of now, I have linear pots for a few full units, so no worries.
At the moment I am away for home, will return Tuesday, hopefully PCBs will be waiting for me and I can get right to assembling and testing. After careful testing of the unit for hissing, buzzing, sound quality (for few hours on various settings, volumes, etcetcetc) I will ship it to Rune as a replacement.
...that should be all, if I forgot to mention something important, let me know, thanks!
