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Messages - Jazz P Bass

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1
The Newcomer's Forum / Re: Newb here. I want to build an amp
« on: May 11, 2020, 09:00:12 AM »
There are a ton of prebuilt low power amps on E bay.
Search TDA2030 amplifier.

Keep in mind that the TDA2030 has been out of manufacture for a number of years.
The items currently on the market are knockoffs.

2
Amplifier Discussion / Re: Woodstock GX-55R SS Amp
« on: May 01, 2020, 01:14:59 AM »
5 pin Mosfet???
Sanken made 5 pin darlington output transistors.
The one that comes to mind is SAP09.
There also was a 15.

3
Schematics and Layouts / Re: "Roland Blues Cube Hot" schematic wanted...
« on: April 27, 2020, 07:42:45 PM »
"Tube Logic – a marriage of solid-state analog technology and DSP"

Not too sure how the schematic will reveal the true nature.

4
The Newcomer's Forum / Re: Big Muff Pi passive tone control and small amps TL072CP, JRC386D.
« on: April 13, 2020, 02:49:21 PM »
I am no expert on the LM386D amplifier IC but it seems to me that adding a 'tone control' circuit on the output of the device is not a good idea.
Have you tried the circuit on the input side?

5
The Newcomer's Forum / Re: Big Muff Pi passive tone control and small amps TL072CP, JRC386D.
« on: April 13, 2020, 11:57:10 AM »
Some type of schematic of what you have tried would be a help.
The tone control is only 5 components.

You can even 'build' it on to a control pot.
http://beavisaudio.com/techpages/BigMuffToneControl/

Here is the schematic of the actual Big Muff TC:

6
Amplifier Discussion / Re: Ampeg Vh140c power transformer replacement
« on: April 01, 2020, 01:32:25 AM »
The transformer in the schematic specifically states "Export Model".
That is not what the OP has.

7
Tubes and Hybrids / Re: Mesa Triple Rec Woes
« on: March 17, 2020, 12:04:32 AM »
Here is the schematic

8
Schematics and Layouts / Re: JC 120 schematic
« on: March 04, 2020, 01:27:16 AM »
Try this:

9
Amplifier Discussion / Re: Marshall MG 50DFX transformer
« on: February 23, 2020, 02:57:16 PM »
Who have you 'tried'?

I would suggest Part Is Parts. 1-800-590-0014 USA/Canada
1-802-365-7257 International

And/ or Full Compass. 800 356 5844

They will do there best to get the part from Marshall.

10
Amplifier Discussion / Re: Marshall MG 50DFX transformer
« on: February 20, 2020, 11:37:05 PM »
Here is the part #: TRANSUD0012 POWER TRANSFORMER  for MG50.

Contact a Marshall distributor and ask if they can get one.

11
The Newcomer's Forum / Re: Laptop charger 3 core cable
« on: February 18, 2020, 12:11:47 PM »
Quote: "Do you think I can just leave the 3rd wire disconnected?".

Again. The third wire is used by the laptop computer itself.

If you simply want to use the supply as an external supply then the third wire is not used.

12
The Newcomer's Forum / Re: Laptop charger 3 core cable
« on: February 17, 2020, 10:43:55 AM »
The 3rd wire is an identifying wire for the laptop.

13
Amplifier Discussion / Re: marshall G30R CD clean channel volume problem
« on: February 14, 2020, 01:13:51 AM »
We;; that was a big help.

14
Amplifier Discussion / Re: marshall G30R CD clean channel volume problem
« on: February 12, 2020, 02:00:15 AM »
I would recommend 'grounding' the clean channel wiper.
That should kill the signal.
As yet, I have seen no resistance measurements of the circuit.
I would look at the junction of C49 & C 22 to ground.
What are the readings when the clean volume control is swept from min to max?

15
Amplifier Discussion / Re: Marshall 5203 220-117v mod?
« on: February 04, 2020, 11:57:18 AM »
So here is a pic of a 220 volt wiring.
Call the Blue wire tap #1.
#1 & 2 are one winding.
#4 & 6 are another winding.
For 220 V ac input the two windings are in series. (tap #2 & 4)
For 110 Vac input the coils should be in parallel.
So wire #1 to #4 and #2 to #6 .

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