Search found 376 matches

by marshmellow
29 Jun 2020, 18:17
Forum: Boutique Stompboxes dissected...
Topic: K&K - Pure XLR Preamp [traced]
Replies: 4
Views: 693

Re: K&K - Pure XLR Preamp [traced]

You're right, I completely overlooked the phantom powering :slap:.
by marshmellow
28 Jun 2020, 10:51
Forum: Boutique Stompboxes dissected...
Topic: K&K - Pure XLR Preamp [traced]
Replies: 4
Views: 693

Re: K&K - Pure XLR Preamp [traced]

Are you sure about R20/R21? I would rather expect 4,7k, 47k, ... There isn't much to point to having an additional pad at the output with a volume control that goes to zero anyway. It only makes it harder for the 4558 to drive such a low load. I don't know if this is meant to plug into a microphone ...
by marshmellow
21 Jun 2020, 10:10
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Komet K.O.D.A.
Replies: 2
Views: 326

Re: Komet K.O.D.A.

Not what I would have expected from a company that builds amps on eyelet boards.
by marshmellow
12 May 2020, 17:51
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Hiwatt Tube Overdrive - gutshots & schematic
Replies: 14
Views: 2176

Re: Hiwatt Tube Overdrive - gutshots & schematic

Definitely put it in, that's a 10ct part. I have no data to present regarding the actual lifespan of the tube, but for longest life it is simply well established rule to keep the heater voltage within at least +-10% (there are rare exemptions where tubes are underheated for noise reduction for examp...
by marshmellow
12 May 2020, 17:14
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Hiwatt Tube Overdrive - gutshots & schematic
Replies: 14
Views: 2176

Re: Hiwatt Tube Overdrive - gutshots & schematic

If you measure 18V on the pins 4 and 5 of the socket, then that's what the tube gets. Really can't believe a tube amp producer like Hiwatt would do that, that's just crazy. The correct dropper resistor would be 39 ohms with 2-3W. Another thought: maybe you got the wrong supply and it is supposed to ...
by marshmellow
12 May 2020, 17:05
Forum: Ready-To-Build Effect Projects
Topic: Wah pressure sensor bypass
Replies: 2
Views: 235

Re: Wah pressure sensor bypass

No, that still works. Like I said, I connected the stock 2PDT switch so that the pedal can still be switched on, it just has no bypass.
by marshmellow
12 May 2020, 13:11
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Hiwatt Tube Overdrive - gutshots & schematic
Replies: 14
Views: 2176

Re: Hiwatt Tube Overdrive - gutshots & schematic

Is the tube really heated with 18V? That wouldn't be very healthy for long. Maybe you overlooked a series resistor.

One minor thing: the JFET symbol is turned the wrong way.
by marshmellow
09 May 2020, 16:57
Forum: Amplifiers
Topic: How to improve tube amplifier tone by changing one part
Replies: 101
Views: 8001

Re: How to improve tube amplifier tone by changing one part

Nah, I'm not of the corksniffing type. I've listened to plenty of tests and comparisons in the past. Whenever I did make out differences, they were just that: minute differences, without any clearly preferred choice. I honestly don't care if a certain cap type will give me smoother highs, I have a t...
by marshmellow
09 May 2020, 14:04
Forum: Amplifiers
Topic: How to improve tube amplifier tone by changing one part
Replies: 101
Views: 8001

Re: How to improve tube amplifier tone by changing one part

But unless you roll your own, you're not really taking your toooan seriously though, aren't you? :slap:

Picture with the four is polyester foil, the other two use paper and are drying after dipping in resin.
by marshmellow
09 May 2020, 13:05
Forum: Ready-To-Build Effect Projects
Topic: Wah pressure sensor bypass
Replies: 2
Views: 235

Wah pressure sensor bypass

The bypass switch in wah pedals always bothered me, so much that I actually barely used it. Having to start and finish in the toe position while firmly pressing down. Then again if the switch actuates too easily you could accidentally switch it off during playing, I just never liked it. So years ago...
by marshmellow
07 Jun 2019, 08:16
Forum: Modern Stompbox Effects (1975 - ...)
Topic: BBE Boosta Grande
Replies: 7
Views: 1649

Re: BBE Boosta Grande

Reduce C6 to 1n.
by marshmellow
06 Mar 2019, 15:13
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: EHX Bad Stone
Replies: 14
Views: 1615

EHX Bad Stone

Just had this here for repair so I thought I'd take a couple of pictures. The wiring was intermittent, somebody messed with the DC jack wiring, and all the dual opamps are switched out and socketed. I have a suspicion the two last issues are related :D. I also fixed the volume drop. Forgot to photog...
by marshmellow
24 Jan 2019, 19:15
Forum: DIY Stompbox designs
Topic: De Profundis delay
Replies: 7
Views: 2108

Re: De Profundis delay

There is also a tone control trimmer to adjust the high pass cutoff frequency on the repeats.
It's also marked as offboard wiring in all the layouts.
by marshmellow
17 Jan 2019, 16:13
Forum: DIY Stompbox designs
Topic: I've designed a Filter Pedal for Bass
Replies: 22
Views: 8040

Re: I've designed a Filter Pedal for Bass

my previous version had in and output caps on the voltage regulator as seen in many of the 780X series datasheets (330nf and 100 nf), but imo theres no difference whatsoever. make sure you use the bigger version and not the 78l06 (those can only go up to 100ma). Im pretty sure you can also use a mo...
by marshmellow
16 Jan 2019, 21:54
Forum: DIY Stompbox designs
Topic: I've designed a Filter Pedal for Bass
Replies: 22
Views: 8040

Re: I've designed a Filter Pedal for Bass

The IC has a maximum voltage of 9V, so with the typical battery or power supply, some sort of protection or regulation is necessary. A zener would work too, sure. If you go with the regulator, add input and output capacitors, otherwise the regulator is in danger of oscillation. It's interesting how ...
by marshmellow
13 Jan 2019, 21:43
Forum: Announcements and Forum Rules
Topic: Report Forum Problems and Make Forum Wishes Here...
Replies: 204
Views: 212270

Re: Report Forum problems here

Seems taken care of now, and we have a new deputy sheriff. :horsey: Best wishes, Dirk!
by marshmellow
13 Jan 2019, 19:27
Forum: Announcements and Forum Rules
Topic: Report Forum Problems and Make Forum Wishes Here...
Replies: 204
Views: 212270

Re: Report Forum problems here

Well, he is only one of the founders of the forum. Also there used to be a couple more moderators when there was way more traffic around here. Considering your long post history... you think your judgment is well placed?

FWIW, Johan didn't read/answer on FB :?.
by marshmellow
07 Jan 2019, 13:21
Forum: Announcements and Forum Rules
Topic: Report Forum Problems and Make Forum Wishes Here...
Replies: 204
Views: 212270

Re: Report Forum problems here

I contacted Johan on Facebook, hopefully he will read it in time.
by marshmellow
16 Dec 2018, 19:20
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Mesa Boogie - Throttle Box [schematic]
Replies: 91
Views: 83751

Re: Mesa Boogie - Throttle Box [schematic]

No, µH again. I used these once for a passive tube EQ, they sold directly from the company. Alternatively, put these two in series ( L1 , L2 ). But they have rather high DC resistance, I would leave out R17. Another option: get this core , wind 270 turns of 0,16mm (34 AWG). Or as Dirk suggested, ask...