Search found 286 matches
- 01 Jan 2021, 06:04
- Forum: Electric Guitar/Bass Wiring
- Topic: Ormond Sparks, Electro-Guitar, Practical Mechanics 1937
- Replies: 3
- Views: 3672
Re: Ormond Sparks, Electro-Guitar, Practical Mechanics 1937
Thanks for sharing these wonderful articles on L Ormond Sparks.
- 18 Mar 2020, 14:29
- Forum: Electric Guitar/Bass Wiring
- Topic: BC Rich booster circuit [schematic]
- Replies: 30
- Views: 21210
Re: BC Rich booster circuit? [schematic]
Here's a trace I made in 1979 of a '76 or '77 Mockingbird preamp & vari-tone. It uses an easy to find 2N5088 NPN low noise small signal transistor, and cheap greencaps. The inductor in the vari-tone was cylindrical and dipped in black resin, and had 1000 stamped on it. I assumed it was 1000mH (=...
- 02 Apr 2018, 01:32
- Forum: Pimp-My-Cheap-Pedal
- Topic: Add Some High End to Tubescreamer TS-9
- Replies: 5
- Views: 3693
Re: Add Some High End to Tubescreamer TS-9
Sorry, my previous diagram is wrong. On this board C5 is actually the 0.22 yellow tantalum capacitor with the yellow circle. It can be replaced with a smaller value electro or a film type if you can squeeze in in there.
- 24 Mar 2018, 05:59
- Forum: Pimp-My-Cheap-Pedal
- Topic: Add Some High End to Tubescreamer TS-9
- Replies: 5
- Views: 3693
Re: Add Some High End to Tubescreamer TS-9
Change NP electro can type capacitor C5 to a lower value to raise the corner frequency of the LP filter - lets more highs through.
- 21 Mar 2018, 23:30
- Forum: Pimp-My-Cheap-Pedal
- Topic: Add Some High End to Tubescreamer TS-9
- Replies: 5
- Views: 3693
Re: Add Some High End to Tubescreamer TS-9
Looking at Photo 13 on page 5 of the Premier Guitar DIY article that Eddie T linked, the fastest way to add more treble is to replace C5 (.22uF Tant) with a .1 or .12 value capacitor. Poly, MKT or box types will work fine. Or do the conversion of the Tone control from active to passive by following ...
- 07 Jul 2017, 04:15
- Forum: Parts & Tools Sourcing & Trading
- Topic: TL071 Substitutes
- Replies: 4
- Views: 4075
Re: TL071 Substitutes
The "Tube Sound Fuzz" uses a CD4049 CMOS Hex Inverter IC, which is not related to the TL071 or TL072 at all and cannot be substituted under any circumstances. Most other Craig Anderton projects use a Raytheon RC4739 or XR4739 dual op amp IC, or a RC4136 quad op amp IC, all of which are now...
- 21 Aug 2016, 05:14
- Forum: Boutique Stompboxes dissected...
- Topic: Menatone None More Black version 1
- Replies: 5
- Views: 9048
Re: Menatone None More Black version 1
Thanks for sharing this. You can post the schematic to the Menatone NMB topic already running in Boutique Stompboxes https://www.freestompboxes.org/viewtopic ... 8&start=20 to avoid duplicate threads.
- 21 Aug 2016, 05:06
- Forum: Amplifiers
- Topic: Need advise with simple mods valveking.
- Replies: 4
- Views: 3883
Re: Need advise with simple mods valveking.
Can you post the schematic for the Valveking 20 MH? It's pretty confusing trying to figure out what you are asking, using the partial board layout you posted.
- 18 Aug 2016, 15:07
- Forum: Amplifiers
- Topic: Marshall MA 100C 100 Watt All Valve Amplifier
- Replies: 147
- Views: 91373
Re: Marshall MA 100C 100 Watt All Valve Amplifier
You are most welcome. The countless hours I spent testing and fixing my 2000 Marshall TSL100 has taught me a lot, some of which I was able to use on Dr Nomis' amp. One thing it taught me is never buy a Marshall made after 1985. The TSL100 has got to be the worst valve amp I've ever owned, whereas I ...
- 18 Aug 2016, 14:43
- Forum: Amplifiers
- Topic: Early KT66 date coding
- Replies: 2
- Views: 2425
Re: Early KT66 date coding
As it's GEC branded rather than Marconi or Osram, the date code could translate as L = 1955 and 5 = May.
- 16 Aug 2016, 05:23
- Forum: Amplifiers
- Topic: Marshall MA 100C 100 Watt All Valve Amplifier
- Replies: 147
- Views: 91373
Re: Marshall MA 100C 100 Watt All Valve Amplifier
Dr Nomis asked me to try and fix his trouble prone MA100C amp after he had taken it back to the shop for "warranty repairs" ( that didn't fix the problems ) and then tried to fix it himself. I took it on as a "rainy day" repair project and after I had a few attempts at it, the am...
- 08 Apr 2015, 04:07
- Forum: Amplifiers
- Topic: Bloody Little Bastard ll solid stage power amp
- Replies: 42
- Views: 18841
Re: Bloody Little Bastard ll solid stage power amp
Thanks for sharing the details of this amplifier with us rcustoms :thumbsup This is just what I need to fix a scorched Laney R4B bass combo amp I have here. It has the usual shorted SMD diodes, transistors and resistors that I see in blown Laney bass amps, and I really don't want to try and rebuild ...
- 05 Aug 2014, 00:09
- Forum: Modern Stompbox Effects (1975 - ...)
- Topic: McGillwell - Fet Booster
- Replies: 9
- Views: 4811
Re: McGillwell - Fet Booster
Have you played it yet? Does the unusual combined vol / tone pot give a range of useful tones?
- 29 May 2014, 00:56
- Forum: Boutique Stompboxes dissected...
- Topic: MusicMan Phasor
- Replies: 9
- Views: 3085
Re: MusicMan Phasor
The Rotor Spear (H&K Rotosphere clone) power supply diagram shows one proven method of deriving various DC supplies from a single AC source. You're getting a handle on it. The fastest way to find out what's going to work would be to go ahead and breadboard it according to your original idea, der...
- 27 May 2014, 00:24
- Forum: Boutique Stompboxes dissected...
- Topic: MusicMan Phasor
- Replies: 9
- Views: 3085
Re: MusicMan Phasor
blackbunny, this is very helpful! This is what I thought as far as the power supply goes, but I would not have thought to change resistor values and the cap. I'd love to run the phasor on 16v, but the Max1044 fizzles above 10v, doesn't it? Yes, you're right, the 1044 'maxes' at 10v input. :roll: I ...
- 26 May 2014, 00:49
- Forum: Boutique Stompboxes dissected...
- Topic: MusicMan Phasor
- Replies: 9
- Views: 3085
Re: MusicMan Phasor
The LFO oscillator which drives the optocouplers LDR1 & 2 uses the -16v rail to enable and disable it, which starts and stops the phasing. The whole Phasor circuit is based around IC5, IC6 and IC7 which are standard workhorse 1458 / 4558 dual op amps. Pin 8 of each op amp is connected to +16v su...
- 16 May 2014, 01:25
- Forum: Amplifiers
- Topic: Marshall MA 100C 100 Watt All Valve Amplifier
- Replies: 147
- Views: 91373
Re: Marshall MA 100C 100 Watt All Valve Amplifier
Good advice from deltafred and bajaman - try replacing that suspect EL34 first. PM me if you don't have a spare handy and I'll try and get one to you quickly. I might just go the whole hog and just replace all the power valves anyway, although the amp sounds okay it does seem a bit underpowered for ...
- 30 Mar 2014, 04:05
- Forum: Amplifiers
- Topic: Marshall MA 100C 100 Watt All Valve Amplifier
- Replies: 147
- Views: 91373
Re: Marshall MA 100C 100 Watt All Valve Amplifier
Simon - normally when the HT fuse blows after switching the standby on (off ? :wink: ) it is a sure sign of a bad power tube - ALWAYS check the screen resistors before replacing bad power tubes :wink: A tube tester takes the guess work away too :secret: The HT sounds about right - did you measure i...
- 25 Mar 2014, 11:22
- Forum: Modern Stompbox Effects (1975 - ...)
- Topic: Hughes & Kettner - Rotosphere [schematic]
- Replies: 103
- Views: 70320
Re: Hughes & Kettner - Rotosphere [schematic]
Just wondering if it's safe to plug in a 15VAC adaptor? (but I'd check the output first) How much voltage do you think a MK1 would handle safely? I wouldn't use a 15VAC supply on this pedal, 13VAC (loaded) @ 700mA - 1Amp would be the maximum. Why? All internal voltages will be be raised by about 25...
- 06 Mar 2014, 23:41
- Forum: Amplifiers
- Topic: Marshall MA 100C 100 Watt All Valve Amplifier
- Replies: 147
- Views: 91373
Re: Marshall MA 100C 100 Watt All Valve Amplifier
If you can find the Chinese 12AX7B preamp tubes - get them - they are currently the best and most consistent emission and quality wise on the market at present I've found them to be consistently good, but they're a bit hard to find in Oz ATM for some reason. Only found one Oz seller so far: EVATCO ...