Search found 433 matches

by ppluis0
14 Jul 2020, 23:57
Forum: Boutique Stompboxes dissected...
Topic: Bernard Raunig - Tube Pre Amp
Replies: 7
Views: 586

Re: Bernard Raunig - Tube Pre Amp

Maybe it's a JCM900 preamp clone. :lol: A JCM900 preamp is worse: have a diode bridge shorted with another diode... :) The assumption that Mr Raunig cloned a Nady TO-2 is due have bass and treble potentiometers. If were another type of preamp using the classical tonestack, why discard to use the mi...
by ppluis0
14 Jul 2020, 03:29
Forum: Boutique Stompboxes dissected...
Topic: Bernard Raunig - Tube Pre Amp
Replies: 7
Views: 586

Re: Bernard Raunig - Tube Pre Amp

The engraving in the front face of the aluminum box suggest me that this is the pcb layout of this thing... Very defying to draw the schematic from that layout :hmmm: BTW in the second image posted by Modman we can see a couple of green leds (probably wired in anti-parallel) acting as clippers. Prob...
by ppluis0
09 Jul 2020, 02:32
Forum: DIY Stompbox designs
Topic: Craig Anderton, Build a Fuzzbox for under $3, Popular Electronics, January 1967
Replies: 7
Views: 292

Re: Craig Anderton, Build a Fuzzbox for under $3, Popular Electronics, January 1967

Personally I think that this appliance works well attached to a transistor amp.
Connecting this box from a tube amp to a loudspeaker enclosure can be risky for the output transformer
by ppluis0
03 Jul 2020, 20:18
Forum: Software Room
Topic: Android Apps
Replies: 6
Views: 4264

Re: Android Apps

Hi folks, Sorry to resurrect an old thread... There is a link to build an inexpensive adapter to use the mic input of a smartphone to act as oscilloscope: https://www.instructables.com/id/A-Preamplifier-for-Smartphone-Oscilloscopes/ Hope will be useful for those that does not have a real o'scope Che...
by ppluis0
29 Jun 2020, 02:59
Forum: Davidoff Library
Topic: Some recently found Web-sites
Replies: 2
Views: 388

Re: Some recently found Web-sites

Hi Mellotron Man and thanks to share your discover with us !!

Just yesterday I found an FTP with lots of schematics (or circuit diagrams :mrgreen: ) http://schems.com/bmampscom/

There are lots of info on FX and most brands of amplifiers.

Enjoy !!!
Jose
by ppluis0
26 Jun 2020, 02:43
Forum: Pedal Debugging & Troubleshooting Support
Topic: Buffer adding hisssssssss
Replies: 10
Views: 291

Re: Buffer adding hisssssssss

Hi Optical,

After implement the RC filter suggested by bajaman, inspect your layout to see if the charge pump is using the same ground tracks of the audio section.

Perhaps the noise you're hearing can be produced from the ground conductors.
by ppluis0
21 May 2020, 00:01
Forum: Pedal Debugging & Troubleshooting Support
Topic: Boss - CE300 Chorus - muting question
Replies: 3
Views: 229

Re: CE300 CHORUS MUTING QUESTION

If you take the precaution to power on all boxes, racks, processors, etc. prior to turn up the volume on your amp you can avoid the use of this feature.

Cheers,
Jose
by ppluis0
20 May 2020, 03:15
Forum: Pedal Debugging & Troubleshooting Support
Topic: Boss - CE300 Chorus - muting question
Replies: 3
Views: 229

Re: CE300 CHORUS MUTING QUESTION

Hi Lani,

Q17, Q19 and their associated components acts as a "soft start" time delay to mute temporarily (by means of Q12 and Q16) the outputs after turn on the unit.

This is intended to avoid "pops" until all supplies stabilize.

Cheers,
Jose
by ppluis0
17 May 2020, 02:34
Forum: Amplifiers
Topic: Newcomb AV-10 -All tube record player used as guitar amp [schematic]
Replies: 5
Views: 1645

Re: Newcomb AV-10 -All tube record player used as guitar amp [schematic]

gght wrote:
17 May 2020, 01:21
Pot similar to this??

https://www.tedweber.com/wp354at
Exactly !!
Once upon a time were common that pots with a fixed taper were used to implement a frequency compensation as function of the loudness level

Cheers,
Jose
by ppluis0
15 May 2020, 19:48
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Hiwatt Tube Distortion - gutshots & schematic [schematic]
Replies: 2
Views: 1758

Re: Hiwatt Tube Distortion - gutshots & schematic [schematic]

Hi tarivol, You have made a great sixth post !!! :applause: As you may remember from the Tube Overdrive topic, again the tube is heated directly with 18V... And this time, I suppose that the tube CAN provide some distortion, especially when you crank the Volume and Drive knob. Feeding this tube heat...
by ppluis0
15 May 2020, 19:24
Forum: Amplifiers
Topic: Newcomb AV-10 -All tube record player used as guitar amp [schematic]
Replies: 5
Views: 1645

Re: All tube record player used as guitar amp [schematic]

Do you see any improvements needed to this amp to work with a guitar? Hi caspercody, Try to remove the feedback resistor (18K) that connects the output transformer secondary to pin 2 of the 6AV6 tube. This way you obtain a slight increase in gain, reduce the damping factor and have increased the di...
by ppluis0
12 May 2020, 04:09
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Hiwatt Tube Overdrive - gutshots & schematic
Replies: 14
Views: 1816

Re: Hiwatt Tube Overdrive - gutshots & schematic

Hi tarivol, You have made a great first post !!! Of course will be interesting to see what similarities and differences can be encountered when you trace your friend's distortion unit. I'm intrigued about the connection of the tube heater... Can you re-check if the pins 4 and 5 of the tube socket ar...
by ppluis0
12 May 2020, 03:44
Forum: Ready-To-Build Effect Projects
Topic: Freestompboxes Baja Mini Tube Overdrive [verified]
Replies: 77
Views: 7406

Re: Freestompboxes Baja Mini Tube Overdrive [verified]

Hi spoontex,

You must use an AC adaptor due this design have a trick to obtain dual supplies from one single power input.

Cheers,
Jose
by ppluis0
18 Apr 2020, 02:32
Forum: DIY Stompbox designs
Topic: Stupid and easy question
Replies: 3
Views: 535

Re: Stupid and easy question

Hi POTL,

Just download a free software to run simulations on tone stacks: http://www.duncanamps.com/tsc/download.html

You can edit values and types of potentiometers and also the remaining passive components for several tone control arrangements and see the resulting response curves.

Cheers,
Jose
by ppluis0
15 Apr 2020, 22:08
Forum: Parts Sourcing & Trading
Topic: Resistor type in Eric Johnson Fuzz Face?
Replies: 6
Views: 1060

Re: Resistor type in Eric Johnson Fuzz Face?

Hi polifemo, Maybe you can cut a trace on the copper side of the board and install (in that side !) a preset in series with the resistor you intend to change. This way you can adjust the gain to the desired level and -when the board is installed again in place- the unit still look original. There is...
by ppluis0
05 Apr 2020, 07:37
Forum: Boutique Stompboxes dissected...
Topic: Stage 3 booster
Replies: 6
Views: 686

Re: Stage 3 booster

Wow it works your advice really works! You're welcome !!!!! But anyway measure the dc voltage (without signal) at each pin of the jfet respect to ground and tell us what values you read. Perhaps you have an defective transistor or -worse- a fake one. I buy from a vendor in ebay a bag with 100's tra...
by ppluis0
04 Apr 2020, 19:33
Forum: Boutique Stompboxes dissected...
Topic: Stage 3 booster
Replies: 6
Views: 686

Re: Stage 3 booster

ballfire wrote:Hey what do you mean decoupling cap.??
Hi ballfire,

You must put a cap in SERIES between the input jack and the 33K resistor that is the input of your pcb.
I think that any poliester cap fom 10 to 47 nF works fine.

Cheers,
Jose
by ppluis0
19 Mar 2020, 05:40
Forum: DIY Stompbox designs
Topic: Clarinot Env Control Circuit Daughterboard (Schem & Vero)
Replies: 9
Views: 1840

Re: Clarinot Env Control Circuit Daughterboard (Schem & Vero

I'm using a 2N3904 for the variable resistance element. Hi Soulsonic, Can you post a diagram about how to implement an NPN transistor modulating the pin 6 of a delay chip ? I'm thinking about this same approach was employed in the Dark Echo delay build some time ago by Jack Deville (a model actuall...
by ppluis0
02 Mar 2020, 03:19
Forum: Amplifiers
Topic: Valve jr power transformer for push pull amp?
Replies: 11
Views: 955

Re: Valve jr power transformer for push pull amp?

bmxguitarsbmx wrote:If you are planning on replacing the output transformer and the power transformer, you should just start a clean build.
I'm agree !!!!!
In my opinion the best (and simpler) amplifier to build is a clone of a Matchless Spitfire.

Cheers,
Jose
by ppluis0
28 Feb 2020, 21:32
Forum: Amplifiers
Topic: Any good resources/books on how to design a power supply?
Replies: 1
Views: 323

Re: Any good resources/books on how to design a power supply

Hi Rambozo,

Tale a look at this link: http://www.valvewizard.co.uk/ there are several explanations about power supplies, heater connections and many other tips about tube amps.

Cheers,
Jose