I am going to try building the Hughes and Kettner Rotosphere. There is a thread on this already from a couple of years ago. The Rotosphere uses an onboard transformer to provide the grid voltage for the 12AX7. On the original, this is a 15V to 250V transformer. I could only find a 230V to 15V transformer which will be wired up in reverse (again this is suggested in the original thread). In the schematic, 280V goes to the 100K resistors connected to the grids of the 12AX7.
I heard a weird rumor that some pedals employ glass-fuses as clippers instead of diodes and transistors...
Does anyone know anything specific? Schematics? Pics?
I bought one of these yesterday and am quite happy with the delay sound, It has 3x V3205 BBD's and I would guess from the way the switch for standard and long delay works that, in the standard (S)short mode one of the V3205 chips is used with a lower clock freq while the longer delay (C) either 2 or all 3 BBD's are used with a higher clock which would give the long but clearer echo. Just guessing at this stage as when switching while playing I can hear that the long delay makes the sound pitch...
I'm in the process of repairng this DOD FX-40b eq. Here are the gutshots. When i received it, the offboard wiring had been tampered with. Does anyone have a schem or diagram showing the switching / offboard wiring ? Or, can anyone lend some clues as to how the power is supposed to be supplied?
I saw a mention of the MXR Sustain pedal in the thread about the Marshall ED-1 Compressor. I just happened to get one I bought a few days ago on eBay in the mail tonight, so I thought I'd take a few quick gutshots since there didn't seem to be much info available on it.
Who can explain me in detail, the parts of an overdrive scheme?
I am learning and I can not understand some things.
For example: The transistors that are in the beginning and at the end of a circuit, those of the end many times are post pot volume and other times behind the pot, why and that they grant, more gain? or are they buffers?
because some use a max 044 or tl7660 at the power input What benefits this?
I just got one of these and I'm impressed but kind of on the fence, because it's WAY too gainey for me and only work for my playing style with the guitar volume way back. It's from Pigtronix/supro and it claims to be based on the power amp section of a supro and to make use of a transformer for saturation, which I'm skeptical about but I'm just a liberal arts major with only the tiniest of clues
I'm wondering if it's radically different from a Supreax Duex? Supro says it's an all new design,...
Does anyone have the Electro-Harmonix English Muff'n schematic?
I can buy one 2th hand but would like to see from the schematic if it's worth modding to a marshall 2203 like preamp pedal.
If the schematic is too far off , ill drop the deal.
EDIT: If anyone has pics of the inside, I welcome those as well... :applause:
This is a nice pedal, not expensive and can be faound cheaper os second hand
A rotary 6 position switch to select some caps for tone shapping and amount of gain.
Two bimos opamps driven into saturaion
I was suirprised at how effectively it cleans with input volume variations, very sensitive.
Most of the component are smd, so no values for the smd caps. Component names match those on the pcb.
I'm planning my next pedal build, and this is going to be a biggy.
I want to build as accurately as possible a version 2 18v Electric Mistress. I've started researching this pedal as much as possible, apart from correcting the notorious volume drop i want to make it as authentic as I can..... Pretty much as I did with my Colorsound Powerboost and Violet Rams Head clones. if need be i'll print and etch my own board ideally cloning from an original, and build it using as many vintage correct...
I did purchase a non-working Morley PWF stompbox from the 70'.
The seller told me the Fuzz part wasn't working anymore.
This post is a work in progress of my attempt to revive it.
IMG_20180630_115415.jpg
Power
First things first : This pedal is 110 VAC powered, I'm in Europe and we're using 220V.
At the same time, I don't like having 220V at my feet with high powered vintage cables on my pedalboard.
If we take a look at the schematics : (found on ) we can see that from the 110VAC 4...
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