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Messages - Jazz P Bass

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The Newcomer's Forum / Re: B-52 schematis
« on: March 24, 2019, 06:14:58 PM »
Would you be so kind as to post the link?

Schematics and Layouts / Re: Variable resistor on marshall scheme
« on: March 17, 2019, 11:59:01 PM »
That symbol is trying to indicate that the wiper (the middle leg) gets attached to either the left or the right leg.

The + of the bridge rectifier is marked 'A'.
The - is marked 'D'.

Schematics and Layouts / Re: Frontman 212r
« on: February 18, 2019, 07:32:54 PM »
I don't believe that switch is available anymore.

Have you attempted to contact Fender?

Amplifier Discussion / Re: Ampeg SVT450
« on: February 17, 2019, 12:27:35 AM »
Use the FX jacks to help narrow it down.

The Send to another amp is your preamp.

The Return is pretty much a line into the power amp.
You can use the Send from another amp or any instrument.

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.

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.

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.

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

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

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)

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.

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.

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'.

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