Search found 67 matches

by turbofeedus
21 Nov 2020, 11:45
Forum: Boutique Stompboxes dissected...
Topic: Monster Effects - Mastortion
Replies: 7
Views: 891

Re: Monster Effects - Mastortion

nooneknows wrote: 21 Nov 2020, 10:58 YATS with a fixed tone shaping
yep. To be fair, I think they admitted as much.
by turbofeedus
21 Nov 2020, 04:13
Forum: Boutique Stompboxes dissected...
Topic: Monster Effects - Mastortion
Replies: 7
Views: 891

Re: Monster Effects - Mastortion

Picked up one of these on Reverb as "not working".... seems fine to me :) Enjoy! Image gallery EDIT: I was staring at the schematic, trying to wrap my head around why there's a fudgin' FWBR in there. I knew there must have been something I missed. See updated schematic. Polarity protection...
by turbofeedus
17 Nov 2020, 04:04
Forum: Boutique Stompboxes dissected...
Topic: JHS Prestige
Replies: 8
Views: 2719

Re: JHS Prestige

bbkassel wrote: 14 Nov 2020, 14:22 Inside view...
That's an... interesting grounding method. Yikes.
by turbofeedus
13 Nov 2020, 11:54
Forum: Amplifiers
Topic: Requesting Laney Klipp circuit analysis.
Replies: 6
Views: 865

Re: Requesting Laney Klipp circuit analysis.

Hi turbofeedus, That schematic looks "almost" like other Hiwatt amps, but the difference lies in the second preamp tube and associated components that are arranged to create insane amounts of distortion. Cheers, Jose Ohhh I see, that's weird I could have sworn the klipp thing was a separa...
by turbofeedus
08 Nov 2020, 23:14
Forum: Amplifiers
Topic: Requesting Laney Klipp circuit analysis.
Replies: 6
Views: 865

Re: Requesting Laney Klipp circuit analysis.

Been slowly getting around to learning how to draw load lines and all the stuff related to tube charts but I was wondering how the Klipp circuit on the Laney Klipp amp works. I got an idea how the bypass is executed but I was wondering what is going on in the Klipp tube stage that creates the hybri...
by turbofeedus
28 Oct 2020, 00:50
Forum: Parts Sourcing & Trading
Topic: BF245A ebay testing
Replies: 0
Views: 794

BF245A ebay testing

After some success with the 2SK117, I wanted to push my luck. Obsolete JFETs are still on the menu, this time some (allegedly) Fairchild BF245A ( datasheet ). ebay item link: https://www.ebay.com/itm/284031825834 ebay seller xripley from Czech Republic: https://www.ebay.com/usr/xripley From a batch ...
by turbofeedus
18 Oct 2020, 01:47
Forum: Boutique Stompboxes dissected...
Topic: smallsound/bigsound - mini [traced]
Replies: 51
Views: 24944

Re: smallsound/bigsound - mini [traced]

This article is a good read for anything regarding JFET amplification.
http://runoffgroove.com/fetzervalve.html
by turbofeedus
16 Oct 2020, 05:00
Forum: Boutique Stompboxes dissected...
Topic: smallsound/bigsound - mini [traced]
Replies: 51
Views: 24944

Re: smallsound/bigsound - mini [traced]

Hello! Just built the ssbs mini and it’s sounds awesome ... ! .. except that I cant get the bias pot and trim to work properly. The lowest voltage on the 5457 drain I can muster is approx 5v via the trim.. the bias pot also only has a 2v range (max is 7v min is 5v). It’s making some difference alth...
by turbofeedus
26 Sep 2020, 12:35
Forum: Boutique Stompboxes dissected...
Topic: Mesa Boogie Tone Burst
Replies: 5
Views: 640

Re: Mesa Boogie Tone Burst

HamishR wrote: 26 Sep 2020, 07:09 Just a query - Looking at U1B are you sure R4 goes to Pin 6 and not Pin 5? I had a feeling it should go to Pin 5 but I may well be way off course!

Thanks!
Yep, had to double check that stage myself. The schem is correct.
by turbofeedus
26 Sep 2020, 04:17
Forum: Boutique Stompboxes dissected...
Topic: Mesa Boogie Tone Burst
Replies: 5
Views: 640

Mesa Boogie Tone Burst

I played one of these in GC and remember thinking it was pretty alright.
I found one cheapish on ebay so I figured I'd trace it.
Enjoy!
P.S. I'm new to eagle, if anyone can help me export the schem to a scalable format I'd reupload.

mbtb1.png
mbtb-1.JPG
mbtb-2.JPG
by turbofeedus
03 Aug 2020, 12:47
Forum: Boutique Stompboxes dissected...
Topic: Fairfield Circuitry - The Unpleasant Surprise
Replies: 29
Views: 9804

Re: Fairfield Circuitry - The Unpleasant Surprise

plush wrote: 02 Aug 2020, 18:05
turbofeedus wrote: 02 Aug 2020, 17:08 Word, thanks Bugg. Did you record the collector voltages for Q1 and Q2?
Q1 and Q2 are jfets...
*Drain voltages
by turbofeedus
02 Aug 2020, 17:08
Forum: Boutique Stompboxes dissected...
Topic: Fairfield Circuitry - The Unpleasant Surprise
Replies: 29
Views: 9804

Re: Fairfield Circuitry - The Unpleasant Surprise

bugg wrote: 02 Aug 2020, 15:43
turbofeedus wrote: 02 Aug 2020, 13:31 Yeah, not sure. Maybe they've forgotten about it? Could just buy the PCB and trace it I guess.
Sorry about the delay, try it now. :D
Word, thanks Bugg. Did you record the collector drain voltages for Q1 and Q2?
by turbofeedus
02 Aug 2020, 13:31
Forum: Boutique Stompboxes dissected...
Topic: Fairfield Circuitry - The Unpleasant Surprise
Replies: 29
Views: 9804

Re: Fairfield Circuitry - The Unpleasant Surprise

Nocentelli wrote: 31 Jul 2020, 23:17
turbofeedus wrote: 23 Jun 2020, 17:43 Bugg is doing it, schematic should be up at some point.
https://www.pedalpcb.com/product/calamityfuzz/
_20200801_001526.JPG
Yeah, not sure. Maybe they've forgotten about it? Could just buy the PCB and trace it I guess.
by turbofeedus
23 Jun 2020, 17:38
Forum: Parts Sourcing & Trading
Topic: 2SK117-Y from ebay seller huweihuye
Replies: 5
Views: 2889

Re: 2SK117-Y from ebay seller huweihuye

soulsonic wrote: 23 Jun 2020, 03:12 OK, I'm almost certain it was this circuit: http://www.geofex.com/Article_Folders/f ... tmatch.gif
GEOFEX is still my go-to source for this kind of thing!
:horsey:
I was thinking more tests for checking the K117 for authenticity.
by turbofeedus
22 Jun 2020, 17:52
Forum: Parts Sourcing & Trading
Topic: 2SK117-Y from ebay seller huweihuye
Replies: 5
Views: 2889

Re: 2SK117-Y from ebay seller huweihuye

You think there's some other tests I could run? I have a bench power supply that does 30V, I could try that across the base-drain junction and see if it smokes? Supposed to handle 50V: https://www.futurlec.com/Datasheet/Tran ... 2SK117.pdf
by turbofeedus
16 Jun 2020, 19:51
Forum: Boutique Stompboxes dissected...
Topic: Crazy tube circuits Falcon overdrive (gut shots)
Replies: 2
Views: 644

Re: Crazy tube circuits Falcon overdrive (gut shots)

Probably a tube -> JFET adaptation, so similar to plexi-drive/supreaux deux/ etc. 18V supply with 1044 IC.
by turbofeedus
11 Jun 2020, 02:53
Forum: Parts Sourcing & Trading
Topic: 2SK117-Y from ebay seller huweihuye
Replies: 5
Views: 2889

2SK117-Y from ebay seller huweihuye

https://www.ebay.com/itm/224020730940 https://www.ebay.com/usr/huweihuye Just thought I'd throw this out there, I rolled the dice on these K117, fully expecting fakes. I tested half of them (25 out of 50) with a Peak DCA75. Average Vgs(off) = -0.351V Average Idss = 1.815mA Standard deviation Vgs(off...
by turbofeedus
02 Jun 2020, 06:01
Forum: Boutique Stompboxes dissected...
Topic: Xotic - RC Booster V2
Replies: 3
Views: 1785

Re: Xotic - RC Booster V2

I figured big pictures would be beneficial. I can resample at max 1MB if that's better.
by turbofeedus
25 Apr 2020, 03:21
Forum: Boutique Stompboxes dissected...
Topic: Electrofoods - Germ Warfare
Replies: 4
Views: 1215

Re: Electrofoods - Germ Warfare

gght wrote:Read the comments.
Read my note.