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Messages - Jazz P Bass

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1
Amplifier Discussion / Re: Ampeg SVT450
« on: February 15, 2019, 11:18:15 AM »
How are you setup test equipment wise?

There are signal voltage references on the schematic that may help narrow down where the issue lies.


2
Amplifier Discussion / Re: Polytone 102 Tremolo
« on: January 25, 2019, 12:44:21 AM »
The IC U2B is set up as a self running low frequency oscillator.

Look above it at IC U3B, pin #9/ R20 also has the Lambda symbol.
I take it that R20 is the LDR.

U2B's oscillating output will allow a change in the resistance of R20.
There is your Tremelo.

3
The Newcomer's Forum / Re: Fender bass cab questions
« on: January 17, 2019, 11:25:32 AM »
If the are all 8 ohms, then the equation works out to 5.33 ohms.

4
Preamps and Effects / Re: Aion lab series l5
« on: January 14, 2019, 01:51:05 PM »
For those following along:

5
Preamps and Effects / Re: Aion lab series l5
« on: January 14, 2019, 12:00:25 AM »
Schematic?????

6
Amplifier Discussion / Re: Polytone Mini S12 Question
« on: January 01, 2019, 09:11:14 PM »
Here is a link of a post from 2009.
And the pics are still there!
(F U PhotoBucket)
https://www.ultimate-guitar.com/forum/showthread.php?t=1172707

7
Amplifier Discussion / Re: Grounding techniques
« on: January 01, 2019, 12:03:16 PM »
I believe that you are missing the point of the Earth connection.

"Wall Wart" power supplies are typically rated as 'Double Insulated'.

Therefore there is no need for a connection to Earth Ground.

If you are having noise issues with the amplifier, I would look into why.

The power pack itself may be the issue, noise wise.

8
The Newcomer's Forum / Re: Carlsbro GLX100 footswitch query
« on: December 30, 2018, 03:53:01 PM »
"so how do I determine which of the pins is which/is ground?"

Use your ohmmeter.
The ft sw ground pin will be at the same potential as the chassis.

The function pins will not.

9
The Newcomer's Forum / Re: Carlsbro GLX100 footswitch query
« on: December 30, 2018, 12:39:46 AM »
Pull any function pin to ground & it will 'operate'.

10
Amplifier Discussion / Re: More gain from Crate 120
« on: December 25, 2018, 11:39:36 AM »
Yeah, I really did not study the circuit for too long.

I do believe the OP is asking too much from a Forum.

11
Amplifier Discussion / Re: More gain from Crate 120
« on: December 24, 2018, 12:37:40 PM »
I  would try changing R76 to a lower value.
(coming off of the OD Lvl wiper.)

12
Amplifier Discussion / Re: Simple SS Power Amp Build - +/- 40V Push/Pull
« on: December 05, 2018, 01:19:15 AM »
There are a bevy of class d amps available on the net.

Small & simple.

Pick one that utilizes the +40/ -40 Vdc supply that you have.




13
Amplifier Discussion / Re: OK to run Marshall Lead 12 into 4 ohm load?
« on: December 03, 2018, 11:26:27 AM »
Why are you going down this road?

14
Amplifier Discussion / Re: Peavey Standard 260 Filter Caps (starting over )
« on: December 01, 2018, 12:47:15 AM »
See if this is close:

15
Amplifier Discussion / Re: Peavey Filter Caps
« on: November 30, 2018, 12:38:03 AM »
"Well fellas, as I practiced putting filter caps In a second Peavey amp head I bought to tinker"

Which model amp are you now working on?

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