Search found 48 matches

by lowbrow
05 Apr 2014, 00:47
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Sola Sound - Tonebender Mark II Professional [schematic]
Replies: 692
Views: 254991

Re: Sola Sound - Tonebender Mark II Professional [schematic]

That's probably true if you use the resistor values he supplies with them, but they work well and sound good if you just slap a 100k trimmer on Q2C and tune for 7.5V +/- with rest at stock values.
by lowbrow
22 Mar 2014, 10:47
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: KENT EA-3 FUZZ TONE BENDER
Replies: 13
Views: 5986

Re: KENT EA-3 FUZZ TONE BENDER

LucifersTrip wrote:Do you have a schematic or gut shot?
Wish I did. Keep meaning to buy one, but it just hasn't happened yet. Have never been able to find either on the net.
by lowbrow
21 Mar 2014, 22:43
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: KENT EA-3 FUZZ TONE BENDER
Replies: 13
Views: 5986

Re: KENT EA-3 FUZZ TONE BENDER

Is that the same as the Walco?
by lowbrow
20 Nov 2013, 18:13
Forum: Boutique Stompboxes dissected...
Topic: Death by Audio - Fuzz War [traced]
Replies: 161
Views: 70160

Re: Death by Audio - Fuzz War [traced]

I've been messing around with this on the breadboard using analog guru's posted schematic for the early seven transistor version. I also breadboarded the later four transistor version, and while it too is also cool, they do not sound the same. Regardless, I corrected the orientation of the transisto...
by lowbrow
10 Sep 2013, 02:14
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Myths, Legends and the Mojo of the Dallas Rangemaster
Replies: 211
Views: 98677

Re: Myths, Legends and the Mojo of the Dallas Rangemaster

I'm thinking water thin superglue is your best bet. Carefully applied it will be a strong repair and not very visible.
by lowbrow
26 Jul 2013, 12:10
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Sola Sound - Tone Bender Mark I (1965) [schematic]
Replies: 325
Views: 193545

Re: Sola Sound - Tone Bender Mark I (1965) [schematic]

Congrats! Two questions. Is that milliamps or microamps? And, I was under the impression stock collector resistor for Q2 was 470k? I thought the 180k was a modification David Main does to make biasing easier. I seem to remember photos of the few original units out there all show a 470k...but its ear...
by lowbrow
25 Jul 2013, 20:28
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Sola Sound - Tone Bender Mark I (1965) [schematic]
Replies: 325
Views: 193545

Re: Sola Sound - Tone Bender Mark I (1965) [schematic]

Try more leakage in Q2. Don't be afraid of A LOT of leakage there.
by lowbrow
16 Jul 2013, 11:23
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Mosrite - Fuzzrite [schematic]
Replies: 103
Views: 90053

Re: Mosrite - Fuzzrite [schematic]

The SK3003 happened to be a bit lower leakage than your average 2N2613. The 2N408 was pretty average.
by lowbrow
13 Jul 2013, 12:14
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Mosrite - Fuzzrite [schematic]
Replies: 103
Views: 90053

Re: Mosrite - Fuzzrite [schematic]

It occurred to me I fell back into a bad habit...dropping the negative sign on those voltages I listed. Sorry about that, consider them implied....negative source, positive ground.
by lowbrow
11 Jul 2013, 16:46
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Mosrite - Fuzzrite [schematic]
Replies: 103
Views: 90053

Re: Mosrite - Fuzzrite [schematic]

Thanks for the info on the transistors. Could you please share some leakage on them transistors or collector voltages with them in circuit? I have tried some different transistors and depending on leakage and gain I have 0.2-4V on q1 and 0.3-1V on q2. I'm trying to get some spirit in the sky tones....
by lowbrow
17 Jun 2013, 17:42
Forum: Stuff Seen for Sale
Topic: FS: Audited trios of Mullard AC-128K germs
Replies: 5
Views: 4257

Re: FS: Audited trios of Mullard AC-128K germs

Some new sets added and price drop…want to move these! For sale, audited trios of NOS Mullard AC-128K germanium PNP transistors for Tonebender Professional MKII circuit (OC75 version)…they can, of course, also be used in Tonebender Mk1 or any other fuzz you may want to try. I think they sound quite...
by lowbrow
10 Jun 2013, 23:22
Forum: Stuff Seen for Sale
Topic: FS: Audited trios of Mullard AC-128K germs
Replies: 5
Views: 4257

Re: FS: Audited trios of Mullard AC-128K germs

Sets 4, 5, 9, 11 & 12 gone now too.
by lowbrow
10 Jun 2013, 17:56
Forum: Stuff Seen for Sale
Topic: FS: Audited trios of Mullard AC-128K germs
Replies: 5
Views: 4257

Re: FS: Audited trios of Mullard AC-128K germs

Sets #1, 2 and 3 gone now.
by lowbrow
10 Jun 2013, 17:02
Forum: Stuff Seen for Sale
Topic: FS: Audited trios of Mullard AC-128K germs
Replies: 5
Views: 4257

FS: Audited trios of Mullard AC-128K germs

http://lowbroweffects.com/wp-content/uploads/2013/06/IMG_1278-1024x817.jpg For sale, audited trios of NOS Mullard AC-128K germanium PNP transistors for Tonebender Professional MKII circuit (OC75 version). I'm asking $17.00 per set postage paid in the USA, paypal accepted. Overseas I'll need to add ...
by lowbrow
29 May 2013, 13:34
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Sola Sound - Tonebender Mark II Professional [schematic]
Replies: 692
Views: 254991

Re: Sola Sound - Tonebender Mark II Professional [schematic]

I would bet Steve uses the method described in the GeoFX "Selecting transistors for a fuzz face" article. Or something very close to it.
by lowbrow
28 May 2013, 19:32
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Mosrite - Fuzzrite [schematic]
Replies: 103
Views: 90053

Re: Mosrite - Fuzzrite [schematic]

A lot of what I've read on gain advice for the Ge Fuzzrite simply doesn't match my own personal real world experience with the transistors they used. The RCA 2N2613 from that era nearly always measure well over 120 hfe (corrected) and 2N408's typically average around high 80's low 90's. Now, I will ...
by lowbrow
17 May 2013, 19:52
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Maestro - FZ-1 [schematic]
Replies: 81
Views: 66376

Re: Maestro - FZ-1 [schematic]

Looking at this again I realize I made a serious error I need to point out. Should have not relied as much on memory and more on my notes. Hopefully a MOD will fix it at some point. The fix: "I set the Attack pot on MINIMUM and adjust the trimmer till I'm getting between 0.2 and 0.3 volts on the col...
by lowbrow
16 May 2013, 20:18
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Maestro - FZ-1 [schematic]
Replies: 81
Views: 66376

Re: Maestro - FZ-1 [schematic]

Thanks fuzzfiend! :D The silicon transistor is a 2N3906 I use for power isolation (emitter follower again) and is part of a charge pump (7660SCL) and voltage regulator (LM337) circuit to give me -3 volts with respect to ground to power this beast. I dislike batteries so set up all my old positive gr...
by lowbrow
16 May 2013, 16:37
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: Maestro - FZ-1 [schematic]
Replies: 81
Views: 66376

Re: Maestro - FZ-1 [schematic]

I can't seem to edit the above post...to fix the soundcloud link I can't get to work. Harumph. Well, here is a direct link:

https://soundcloud.com/lowbrowindy/new-fz1-clip