Search found 593 matches

by Electric Warrior
01 Aug 2020, 09:53
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Zonk Machine - middle transistor is silicon ??? trim pot
Replies: 33
Views: 11527

Re: Zonk Machine - middle transistor is silicon ??? trim pot

BMS1971 wrote: 08 Jul 2020, 17:39 Hello
I cannot find any information about the first transistor TIA02618. Any datasheet available?
Cheers
Benoit
There's some info in this catalog:
https://archive.org/details/TNM_Semicon ... 9/mode/2up
by Electric Warrior
28 May 2020, 16:49
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Vox - V816 Distortion Booster: GE an SI versions! [schematic]
Replies: 16
Views: 3995

Re: Vox - V816 Distortion Booster: GE an SI versions! [schematic]

Here's a neat version. I can consider it confirmed now :D
Thanks again to Rafmax!
Vox Distortion Booster (Red Silicon).png
by Electric Warrior
21 May 2020, 12:22
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Vox - V816 Distortion Booster: GE an SI versions! [schematic]
Replies: 16
Views: 3995

Re: Vox - V816 Distortion Booster [schematic]

Nightraven confirmed my schematic. His unit has a 2.5µF instead of a 1.6µF, but I think other than that it's identical with the one I traced.

Thanks to nightraven and rafmax for helping me with this.

Enjoy!
Vox Distortion Booster (Germanium).png
by Electric Warrior
05 May 2020, 13:48
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Vox - V816 Distortion Booster: GE an SI versions! [schematic]
Replies: 16
Views: 3995

Re: Vox - V816 Distortion Booster [schematic]

No, the germanium unit only has two transistors. They omitted the first stage, kinda similar to the WEM/Rush Pepbox, but with additional tweaks. Actually the article no. in the 1965 US catalog is V86. I guess could have been the UK version as it appears the US version was still in the works in Oct/N...
by Electric Warrior
04 May 2020, 12:50
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Vox - V816 Distortion Booster: GE an SI versions! [schematic]
Replies: 16
Views: 3995

Re: Vox - V816 Distortion Booster [schematic]

The red ones come with two different circuits: One is germanium and FZ-1 based, the other uses a MK1.5/Fuzz Face topology, but it's different from the american version of which you posted the schematic.
by Electric Warrior
11 Apr 2020, 07:45
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Colorsound Carlsbro - Wah Fuzz [schematic]
Replies: 10
Views: 2046

Re: Colorsound Wah fuzz [schematic]

You misidentified the transistors. Q1 is actually Q2. Sorry, I went from left to right in the designation. If I change the current amplification of both BC238BP transistors in my simulation to 300 and take the resistance values from the Fuzzface Simulator, I get nearly the values you measured in yo...
by Electric Warrior
10 Apr 2020, 21:57
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Colorsound Carlsbro - Wah Fuzz [schematic]
Replies: 10
Views: 2046

Re: Colorsound Wah fuzz [schematic]

You misidentified the transistors. Q1 is actually Q2.

Collector voltages are approx. 1.2V and 3.58V in my Wah Fuzz Straight - pretty much exactly what I got out of the caclulator:
calculator.png
Sounds good with none of the problems you have. 3.15V on Q2C should still be ok...
by Electric Warrior
09 Feb 2020, 17:09
Forum: Pedal Debugging & Troubleshooting Support
Topic: HELp! Silicon Fuzz Face Clone Issues
Replies: 2
Views: 218

Re: HELp! Fuzz Face Clone Issues

I assume that the gain of the 2N2222 is too low for this application. I have found the following recommendation for this circuit: Transistors are BC108 or BC107 matched around 260 hFE for both Bias Q 1 Col lector to 1.35V, Q2 Collector to 5.75V For this selection, the BC107 and BC108 transistors mu...
by Electric Warrior
23 Oct 2019, 20:45
Forum: Parts Sourcing & Trading
Topic: Effective, safe and lasting method against scratchy pots
Replies: 12
Views: 2269

Re: Effective, safe and lasting method against scratchy pots

Not a very attractive solution, considering how much the value of a vintage pedal is lost due to changed components. I get your point and it would be fine with a modern pedal. For the old one i would at least do my best to prolong good function of the old pots and am therefore wondering about the b...
by Electric Warrior
23 Oct 2019, 19:59
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Hornby (Skewes, JHS) Selectatone T.B.2 (Treble/Bass Booster)
Replies: 37
Views: 13134

Re: Hornby (Skewes, JHS) Selectatone T.B.2 (Treble/Bass Boos

probably 0.1µF for both. It's confirmed for the silicon version.
by Electric Warrior
28 Aug 2019, 21:40
Forum: Pedal Debugging & Troubleshooting Support
Topic: Tone Bender II transistor bias issue
Replies: 4
Views: 313

Re: Tone Bender II transistor bias issue

he suggested readings in the build doc are - Q1: C -8.5v B -0.05v E 0v With both trims at 100% - Q1: C -9.33v B -0.001v E 0v The base voltage of Q1 is determined by the collector base leakage current that flows through the 100 Kiloohms resistor between base and ground. Your read base voltage ist to...
by Electric Warrior
17 Aug 2019, 22:42
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Zonk Machine - middle transistor is silicon ??? trim pot
Replies: 33
Views: 11527

Re: Zonk Machine - middle transistor is silicon ??? trim pot

Yes sir, exactly. There is a "D8" code on the "Fuzz" pot. RS (Radio Spares) UK potentiometers use only two digits. The first digit is a letter from A to L representing one of the twelve months of the year. The second digit is the last digit of the year of production. So, the “D8” on the RS pot in t...
by Electric Warrior
30 Jun 2019, 11:07
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Zonk Machine - middle transistor is silicon ??? trim pot
Replies: 33
Views: 11527

Re: Zonk Machine - middle transistor is silicon ??? trim pot

There's a fun article on the Zonk here: https://www.vintageguitar.com/23068/hornby-skewes-zonk-machines/ "Skewes translated that cultural shift into a business; with his wife, Madge, he founded his own musical-instrument company in ’65, from his home in Garforth, in West Yorkshire – far from swingi...
by Electric Warrior
18 Jun 2019, 19:58
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Zonk Machine - middle transistor is silicon ??? trim pot
Replies: 33
Views: 11527

Re: Zonk Machine - middle transistor is silicon ??? trim pot

? The guy that had it before me is a very talented tube amp builder and actually pulled the 2N4061 and replaced it with an OC71, because he couldn't find any schematic or evidence of this version, so he thought it was an aftermarket repair/mod. I don't blame him. Ergh, you sure he's not a hack? :sh...
by Electric Warrior
10 Jun 2019, 13:20
Forum: Announcements and Forum Rules
Topic: https
Replies: 4
Views: 2136

https

My browser keeps complaining that the connection with this site isn't secure and advises me not to submit my password. Could we have a https version, please?
by Electric Warrior
08 Jun 2019, 08:08
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Tone Bender MKII - Sustain
Replies: 5
Views: 3471

Re: Tone Bender MKII - Sustain

What does the original ad for the Supafuzz say in the Marshall Amp book, a "full 19 seconds of sustain" or something like that? How'd they measure that I wonder. :shock: First version had a modified Tone Bender mkI circuit. http://www.bigmuffpage.com/The_Tonebender_Timeline_2.html But by 1967 they ...
by Electric Warrior
12 May 2019, 09:20
Forum: Parts Sourcing & Trading
Topic: BC183L
Replies: 6
Views: 2272

Re: BC183L

Hi, Lately I've gotten really into Fuzz Face building again which is lot's of fun. I've got a great selection of transistors, both germanium and silicon, but this far I've been unable to get my hands on some BC183L's. I've got both B's and C's (built a very nice BC183C FF today :-) but I'm curious ...
by Electric Warrior
26 Apr 2019, 17:23
Forum: Parts Sourcing & Trading
Topic: Are these Fake? (NKT275)
Replies: 4
Views: 1736

Re: Are these Fake? (NKT275)

The writing should be the other way round and in 2 lines, NKT in one and 275 in the other. There should also be a red dot next to the collector lead. There are at least three different styles that were used in vintage Fuzz Faces. While the more common types were labled length wise, this variant is ...
by Electric Warrior
09 Apr 2019, 12:27
Forum: Pedal Debugging & Troubleshooting Support
Topic: Fuzz Face note decay issue?
Replies: 7
Views: 474

Re: Fuzz Face note decay issue?

Oh yeah, the trimmer explains it. If you set it to 8k2 you'll probably end up with a lower voltage on Q2C. The trimmer on Q1 sets the voltages for both, Q1 and Q2 as Q2's collector voltage mostly depend on Q1 and how it is set up. What's the problem with Q1's base voltage? It mostly depends on the t...