Search found 30 matches

by ironman28
09 Sep 2014, 18:00
Forum: Modern Stompbox Effects (1975 - ...)
Topic: T-Rex Yellow Drive (Gutshots)
Replies: 17
Views: 12509

Re: T-Rex Yellow Drive (Gutshots)

the YD and MH are pretty close. I havent seen gutshots of the MHII yet.
The MHII A and B sides are the same. On the YD they restricted the gain of the A side to give the impression of an overdrive/distortion combo.
The YD is a nice RAt substitute for under a $100 used
by ironman28
09 Sep 2014, 15:22
Forum: Modern Stompbox Effects (1975 - ...)
Topic: T-Rex Yellow Drive (Gutshots)
Replies: 17
Views: 12509

Re: T-Rex Yellow Drive (Gutshots)

The Yellow Drive is based on the Mudhoney which is basically a Rat. The A side has 47R/4.7uf and a 560R/4.7uf legs in the FB loop which gives rolloffs at 720hz and 60hz respectively. The A drive pot is 4.7K audio. The B side has 47R/3.3uf and a 560R/4.7uf legs in the FB loop which gives rolloffs at ...
by ironman28
14 Dec 2013, 14:28
Forum: Boutique Stompboxes dissected...
Topic: Pigtronix - Fat Drive [traced]
Replies: 6
Views: 8061

Pigtronix - Fat Drive [traced]

4049 based OD. Very thick low end. Sounds best with SC pups

Image
Image
by ironman28
03 May 2012, 14:09
Forum: Modern Stompbox Effects (1975 - ...)
Topic: MXR distortion II pics
Replies: 15
Views: 8246

Re: MXR distortion II pics

A1= 4016 R5= 240K R8= 50K Pot R11=300K R15=300K C4= 20pf C9= 1uf C12=.033uf C13=.033uf C15=470pf C16=1uf C17=.33uf C18=10uf C19=400uf CR1-8 =1n914 Hopefully the pic above helps also. If you build this you can elminate the 4016 and associated circuit and use a TPDT switch or a latching relay for bypa...
by ironman28
04 Apr 2012, 19:13
Forum: Modern Stompbox Effects (1975 - ...)
Topic: MXR - 143 Limiter [schematic]
Replies: 21
Views: 17295

Re: MXR 143 (guts) [schematic]

Not two versions , two different units with different construction. Both are CA3280 chips. I have not compared the two part by part to see if there were any differences. I dont have time to redraw right now so... https://i1158.photobucket.com/albums/p616/jplaudio/mxr143schem-page-001.jpg I wont leav...
by ironman28
29 Mar 2012, 22:51
Forum: Modern Stompbox Effects (1975 - ...)
Topic: MXR - 143 Limiter [schematic]
Replies: 21
Views: 17295

Re: MXR 143 (guts) [schematic]

I have the factory schematic and layout that I can link here as long as the mods are ok with it. My intent was to redraw the schem and post to avoid IP issues. I have not used either one yet so I cant give you a review. Here is one: http://www.ovnilab.com/reviews/mxrlimiter.shtml Heres the track sid...
by ironman28
28 Mar 2012, 22:57
Forum: Modern Stompbox Effects (1975 - ...)
Topic: MXR - 143 Limiter [schematic]
Replies: 21
Views: 17295

MXR - 143 Limiter [schematic]

https://i1158.photobucket.com/albums/p616/jplaudio/DSCN0190.jpg https://i1158.photobucket.com/albums/p616/jplaudio/DSCN0191.jpg https://i1158.photobucket.com/albums/p616/jplaudio/DSCN0192.jpg https://i1158.photobucket.com/albums/p616/jplaudio/DSCN0194.jpg https://i1158.photobucket.com/albums/p616/j...
by ironman28
14 Mar 2011, 22:54
Forum: Amplifiers
Topic: Mod to reduce filament hum
Replies: 6
Views: 3280

Re: Mod to reduce filament hum

I did not say "perfect"
I said better
So what ratio of resistance would result in minimum hum? other than something selected by pure chance
and in the example of the "humdinger" at what setting of the pot would the hum be minimized?
by ironman28
14 Mar 2011, 21:03
Forum: Amplifiers
Topic: 2 8ohm speakers Plus 2 16ohm speakers and one fender deville
Replies: 13
Views: 4552

Re: 2 8ohm speakers Plus 2 16ohm speakers and one fender dev

Tube/Valve Amplifiers are more finicky when it comes to connecting speakers, for a proper impedance match, you MUST make sure that the speakers present the correct impedance load to the amplifier, otherwise you will do one of these things to the Amplifier: 1, You will cook the Output Transformer......
by ironman28
14 Mar 2011, 20:28
Forum: Amplifiers
Topic: Mod to reduce filament hum
Replies: 6
Views: 3280

Re: Mod to reduce filament hum

I would like some input from an experienced engineer or amp tech who is familiar with this issue: For amps with a 6.3vac secondary filament winding with no center tap, I know it's a common mod to help alleviate hum to route this wiring to the tube heaters and to the pilot light where a voltage divi...
by ironman28
13 Mar 2011, 20:29
Forum: Modern Stompbox Effects (1975 - ...)
Topic: MXR distortion II pics
Replies: 15
Views: 8246

Re: MXR distortion II pics

little late but... anyway [smilie=rlp_smilie_242.gif]

DII mods
C2= .02
R16=150k
R14=3k3 (if your unit has a 1.5k fitted)
R21= try raising this value for more output. Too high and you will get feedback from coupling
by ironman28
13 Mar 2011, 15:25
Forum: Boutique Stompboxes dissected...
Topic: Death By Audio - Harmonic Transformer - Guts [traced]
Replies: 105
Views: 35044

Re: Death By Audio - Harmonic Transformer - Guts [traced]

I think they should use bigger switches...plenty of room Connecting the Anode of a Led to Negative,and the Cathode to positive will result in the Led not emitting any light,since the Led will be reverse-biased,Leds are a special type of Diode which emit light when forward-biased,and,like small signa...
by ironman28
16 Nov 2009, 15:18
Forum: Printed/Published Online Designs
Topic: How to place a variable load on your guitar pickups?
Replies: 5
Views: 2328

Re: How to place a variable load on your guitar pickups?

Here are some ideas to work with: http://www.muzique.com/lab/pickups.htm http://buildyourguitar.com/resources/lemme/ lots of ways to load the output of the pickup with resistance, capacitors or inductors. Then there are the classic Varitone circuits used in Gibson guitars or the L6-s variable mid co...
by ironman28
21 Jun 2009, 22:49
Forum: Modern Stompbox Effects (1975 - ...)
Topic: MXR Distortion II
Replies: 5
Views: 8996

Re: MXR Distortion II

The DII is kind of the sleeper of the original MXR line. I dont think they were big sellers when they were introduced. The distortion character is very dynamic and woody or resonant sounding. The resonance control is a low frequency parallel gain stage with an input level control. The drive and reso...
by ironman28
02 Jun 2009, 19:50
Forum: Modern Stompbox Effects (1975 - ...)
Topic: DOD - FX10 BiFET Preamp [schematic]
Replies: 20
Views: 24645

Re: DOD FX10 BiFET Preamp (Booster Pedal) [schematic]

yeah I can see how someone could infer that there are 2(bi)-FET's in the box. The term is technically accurate so I don't think DOD was trying to fool anybody. There were DOD FET preamps before they made the 410 or the FX10 so maybe it was an attempt to differentiate them from the earlier FET preamp...
by ironman28
01 Jun 2009, 18:36
Forum: Modern Stompbox Effects (1975 - ...)
Topic: DOD - FX10 BiFET Preamp [schematic]
Replies: 20
Views: 24645

Re: DOD FX10 BiFET Preamp (Booster Pedal) [schematic]

It's funny how it's name has little to do with the actual circuit. You would expect something with two JFET gain stages, or something like the MOSFET Booster from AMZ ... In fact the J113 are switches and the 4007 CMOS acts as a latch for the stompswitch. The onlt FETs actually amplifying the signa...
by ironman28
29 Apr 2009, 13:03
Forum: Boutique Stompboxes dissected...
Topic: Pete Cornish - P-2 guts
Replies: 242
Views: 87167

Re: Cornish P-2 guts

It's got to be some kind of protection to keep the artist from getting electrocuted when touching a grounded micstand while plugged into an amp with a different "ground" potential. You might still feel a little shock through the capacitor, but it would probably prevent the current from re...
by ironman28
27 Feb 2009, 17:05
Forum: Amplifiers
Topic: Adding Clean Channel to Peavey Windsor
Replies: 107
Views: 32452

Re: Adding Clean Channel to Peavey Windsor

An extra preamp tube is not a requirement for a "clean" channel. Most modern channel switching amps use a tapped gain block of some kind or switched attenuation to achive both clean and overdriven sounds from the same tube count. The peavey 5150 uses switched attenuators for the "chan...
by ironman28
10 Jan 2009, 18:53
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Vox - SATCHURATOR pedal [schematic]
Replies: 114
Views: 71004

Re: New Vox SATCHURATOR pedal [schematic]

How about the other side of the board? any components there?
silksceen goes up to Q19 for transistors but clearly some are not fitted like Q13 (unless there on the other side)
looks like the board may be for several models with component numbers silkscreened :hmmm: