Search found 84 matches

by clintrubber
15 Dec 2022, 19:47
Forum: Pedal Debugging & Troubleshooting Support
Topic: Tremulus Lune - identifying which PCB-maker ('E3'? 'MM'?)
Replies: 1
Views: 309

Tremulus Lune - identifying which PCB-maker ('E3'? 'MM'?)

Tremulus Lune - identifying which PCB-maker ('E3'? 'MM'?) Got a broken tremolo pedal in, it's most likely a version of the Tremulus Lune. Pots: Smooth/Sym/Speed/Depth/Space (1) TL072, (1) 4558 and (1) Xvive vactrol, one green dot, so probably a 5C2. The PCB is marked with 'Tremolo v.1' and has a kin...
by clintrubber
27 Mar 2022, 13:00
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Danelectro - DSR-1 Spring King ( dead links )
Replies: 29
Views: 17101

Re: Danelectro - DSR-1 Spring King ( dead links )

Thanks for sharing! I have a broken unit, haven't repaired it yet. This sure comes in handy. So the "volume" is (in 'Fender Reverb Unit Speak') actually a "dwell", didn't know that. [edit]Assuming the slapback & reverb mix-portions are both increased when turning the "re...
by clintrubber
15 May 2021, 17:46
Forum: Pimp-My-Cheap-Pedal
Topic: Boss GE-7 Mods
Replies: 135
Views: 132648

Re: Boss GE-7 Mods

Got an old GE-7 in today, the type still using the ACA adaptor. Needs some work, as was announced - but surprisingly the freq-sliders don't have any freq-selective effect. Looking inside, no messing around or after-fab soldering as it seems.... but I found the gyrator-opamps all three being the TI N...
by clintrubber
14 Jul 2020, 16:16
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Behringer - UV300 Ultra Vibrato
Replies: 2
Views: 2301

Re: Behringer - UV300 Ultra Vibrato

Thanks for the circuit-snippet! Do you perhaps also know the location of the C1 cap that influences the rise-timeconstant? In the original VB-2 that is C26 (6.8 uF/16V), and while the UV300 already seems to use 10uF according to your traced circuit, it might be increased a bit further to my taste, s...
by clintrubber
02 Jul 2019, 19:09
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Carl Martin - Quattro [schematic]
Replies: 18
Views: 17131

Re: Carl Martin - Quattro [schematic]

What's going on with the bridge rectifier in the opamp loop? And is D1 a Zener? It's not too uncommon, thought to have seen it in Marshall (tube!) amps form long ago already as well, and they might not have been the first. Just follow the direction of the diode-arrows for a positive signal, and the...
by clintrubber
01 Jul 2019, 23:32
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Radial - Bigshot PB1 Class A Power Booster [schematic]
Replies: 14
Views: 10034

Re: Radial - Bigshot PB1 Class A Power Booster [schematic]

Oops, Complementary Feedback Pair, not Complimentary Feedback Pair... ;-)
by clintrubber
01 Jul 2019, 23:30
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Radial - Bigshot PB1 Class A Power Booster [schematic]
Replies: 14
Views: 10034

Re: Radial Bigshot PB1 Class A Power Booster [schematic]

Are Q4 and Q5 some kind of weird darlington arrangement? They form another two transistor combination, the so called Complimentary Feedback Pair, a.k.a. Sziklai, more here: https://en.wikipedia.org/wiki/Complementary_feedback_pair (doesn't matter one of them here is a FET iso BJT as shown in the wi...
by clintrubber
09 Nov 2018, 18:08
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Rocktron Hush Noise Reduction [schematic]
Replies: 15
Views: 11720

Re: Rocktron Hush Noise Reduction [schematic]

Coolcat0078 wrote:Could anyone tell me if this is verified or looks right?
I share your feeling that this schematic looks a bit puzzling, or drawn unintuitively, or potentially wrong on some spots.
But good to have it, thanks!
by clintrubber
21 Jun 2018, 10:34
Forum: Pimp-My-Cheap-Pedal
Topic: Lets get the TSs done!
Replies: 10
Views: 16571

Re: Lets get the TSs done!

Received the purple Nady version, so I can answer a few of my own questions now :lol: Some observations, FWIW: * The stompswitch is indeed an unlatching type (on which the circuitry at the lower left corner of the PCB already hinted actually) * They use a cumbersome internal bracket to mount the pot...
by clintrubber
15 Jun 2018, 18:10
Forum: Pimp-My-Cheap-Pedal
Topic: Lets get the TSs done!
Replies: 10
Views: 16571

Re: Lets get the TSs done!

Thanks for posting the Ashton/Nady guts.

Good to hear the case-top is metal as well. I just bought the purple Nady version.

Hey that's surprising, the metal switch and not being true bypass. OK, it'll be a simpler switch then... just a SPST-push type? Is there enough room for a 3PDT ?

Thanks!
by clintrubber
05 Jun 2018, 16:30
Forum: Pimp-My-Cheap-Pedal
Topic: Behringer FCV-100 Volume Pedal
Replies: 18
Views: 17746

Re: Behringer FCV-100 Volume Pedal

Speaking of the FCV100, I was surprised to notice crackling when operating the pedal. Thought this wouldn't happen with a pedal that uses VCA's for the volume control, but it did crackle... Looking at the schematic, R26, R28, C6 are filtering the wiper of the controlling pot VR2B... and R23, R22, C1...
by clintrubber
05 Jun 2018, 16:24
Forum: Pimp-My-Cheap-Pedal
Topic: Behringer FCV-100 Volume Pedal
Replies: 18
Views: 17746

Re: Behringer fcv100

This is quite old, but I'll post for reference. I guess the loss of tone is due its relatively low input impedance of 300k (according the manual). I think one can workaround it by changing the 330k R12 and R13 resistors to 1MOhm. Hi, As it was described, it won't work to raise the input impedance. ...
by clintrubber
16 Apr 2018, 12:20
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Radial - Bigshot PB1 Class A Power Booster [schematic]
Replies: 14
Views: 10034

Re: Radial - Bigshot PB1 Class A Power Booster [schematic]

Interesting they use dual pots while the schematic doesn't require them....

possibly duals for mechanical reasons ?
by clintrubber
06 Apr 2018, 10:56
Forum: Amplifiers
Topic: Peavey Backstage Plus 35W Guitar Amp
Replies: 9
Views: 8664

Re: Peavey Backstage Plus 35W Guitar Amp

FWIW: having a Backstage 30 and a later Backstage (coloured knobs, reverb, satur.-circ.) side by side, it's interesting/boring/(ir)relevant to see the changes they've made: -to my surprise the cabinet height of the latter is slightly less. -the alu side-trims on the baffle are smaller for the latter...
by clintrubber
06 Apr 2018, 10:54
Forum: Amplifiers
Topic: Peavey Backstage Plus 35W Guitar Amp
Replies: 9
Views: 8664

Re: Peavey Backstage Plus 35W Guitar Amp

from Hotrox (hotroxuk.com) The amp has arrived, pots are indeed a bit scratchy, but all functional, so hope just some spraying will do for now. Thanks for the Hotrox-info, might come in handy... Might be good that I have a look already for a spare saturation-pot since that'll be the most difficult ...
by clintrubber
30 Mar 2018, 14:43
Forum: Amplifiers
Topic: Peavey Backstage Plus 35W Guitar Amp
Replies: 9
Views: 8664

Re: Peavey Backstage Plus 35W Guitar Amp

Hi,

Curious if you managed to find that non-standard dual pot for the saturation-position?
Have a 'non-Plus' Backstage upcoming which uses the same pot, and it seems to be scratchy...

Thanks
by clintrubber
28 Mar 2018, 10:46
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Boss - DI-1 Direct Box [schematic]
Replies: 23
Views: 17491

Re: Boss - DI-1 Direct Box [schematic]

I also found out that there is an error in the original design. There is switch to swap the inverting and non-inverting line on the XLR connection but when the switch is in 'normal' position it is actually inverted (pin 2 normally carries the 'hot' non-inverted signal). But maybe that is different ...
by clintrubber
17 Mar 2018, 13:55
Forum: Modern Stompbox Effects (1975 - ...)
Topic: TC Electronic - MojoMojo
Replies: 32
Views: 12312

Re: TC MojoMojo

no reason to spend time reversing it,its 35 used in my country. For fun?for 35 bucks you can have much more fun with other activities... I understand what you say, valid remark. But reversing also serves the purpose of understanding what's going on in the circuit, to learn from it. That sounds like...
by clintrubber
24 Feb 2018, 14:55
Forum: Modern Stompbox Effects (1975 - ...)
Topic: TC Electronic - MojoMojo
Replies: 32
Views: 12312

Re: TC MojoMojo

Thanks, that'll indeed be the spot were I saw it.

Bye