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Messages - TGP39

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Open Discussion / Re: Low noise resistors for EQ
« on: November 17, 2021, 11:19:02 PM »
Since de-rating resistors is said to lower temperatures and thus help noise in any that may be self heating, how do you identify the ones that generate heat?

The VFE production build is using all 1/4 watt resistors so I'm wondering if using 1/2 watt in certain places might help

Heat dissipation within a resistor can be measured by calculating the Power that runs across that resistor.   Since the Formula for Power is P=V2/R, (voltage squared) / Resistance, you can quickly see that resistors with very low values will generate the most power and thus the most heat (assuming voltage is constant across each resistor).

Hope this helps a bit,


Build Reports / Re: PT-80 with Bontempo module
« on: September 26, 2021, 12:21:25 AM »
Wow.  I really love the etch idea. I do a lot of etching and it is indeed a labor intensive process, but the results are so nice.  Wonderful circuit as well. 


Open Discussion / Re: Small bear retiring
« on: September 26, 2021, 12:15:21 AM »

I'm particularly concerned about pots.  Small Bear was one of the few that carried all values across 16mm and 9mm.  Plus, you could get quantity discounts by pot type/size, not just by value, which is how most normal distributors handle it.

This is my biggest concern too.  Nobody has the potentiometer selection that Smallbear has.  They put mouser / Digikey to shame.  Good luck finding those obscure double ganged pots without them.

Open Discussion / Re: Marshall key holder
« on: May 29, 2021, 02:02:32 AM »
I wanted to buy a key holder and put an amp inside. That would be nice.

For must people I would just find that comment funny.  For you, Iím waiting for the build report. :)

Open Discussion / Re: Phase45 Zener (1n5230)
« on: April 16, 2021, 10:06:37 PM »
The 1N5230 is a 4.7V zener diode.  Iíve looked at three different schematics and they all list the zener diode at 4.7v   4.7v is what you want. 


Build Reports / Re: Forum Vibe
« on: March 23, 2021, 04:23:40 AM »
This is fantastic Gordo!

Build Reports / Re: Dumble ODS preamp with submini tubes
« on: March 09, 2021, 03:58:55 AM »
Itís so obvious how well thought out this entire build is.  Fantastic job Jason. 
Is the faceplate acrylic?  Did you use your Beamo to design it?
The skills necessary to pull this off is mind blowing. 
Just amazing. 

Build Reports / Re: SmallBazz - Germanium Discrete Darlington Bazz Fuss
« on: February 16, 2021, 02:59:55 AM »
This laser and backfill technique is something I would love to do.  This looks really nice.  Great job.

Tech Help - Projects Page / Re: Dragonbeard Trim Pot
« on: February 14, 2021, 02:17:18 AM »
Yea, thatís confusing.  Itís definitely a 9mm right angle pot.  Madbean listed it as 9mm plastic shaft pot so I think this is the correct pot;

Build Reports / Re: Edgelord Bass Filter
« on: February 14, 2021, 01:58:45 AM »
There is some fantastic soldering inside there.  Beautiful work. 

Open Discussion / Re: Whetstone kits
« on: February 11, 2021, 11:45:00 PM »
Iím almost done with mine.  Iíve corresponded with Kyle a few times. He is a very nice and helpful individual and this has been a fun project.  Does anyone know what model number the subminiature dpdt switches are?  The bushing needs to be a certain length for everything to fit properly.  I could also use some guidance wiring the 1P12T rotary switch he sent.  Thanks in advance. 

General Questions / Re: Reverse voltage hurt a Belton brick reverb?
« on: February 08, 2021, 07:27:54 PM »
Those Belton Bricks are really voltage sensitive with an operating range of 4.5 to 5.5 volts. 
If your 5 volt regulator broke down, Iím guessing you had -9v directly to pin 1 on the BTDR-3H.
I think this would cause the Belton Brick to fail. 
Maybe others who have experience with this brick could chime in. 

Build Reports / Re: Bass Machine - Junk Trunk Gas Tank Combo
« on: February 08, 2021, 01:02:44 AM »
Wow.  Beautiful job inside.  Well done. 

Open Discussion / Re: Mutron dimension
« on: February 03, 2021, 07:38:00 AM »
Mutton Phasor II vintage per Mutronís website;

Dimensions: 8ĺĒ l. X 5″ w. X 3⅛Ē h.

Build Reports / Re: Pedal PCB Parenthesis (EQD Life)
« on: January 30, 2021, 04:29:09 AM »
I am just about to build this one.  Very inspiring!
The inside is perfect.  I need to work on my wiring. 

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