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Old 10th March 2013, 01:07 AM   #11
osci is offline osci  Australia
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Quote:
Originally Posted by Harleyjon View Post
I wish you luck with your new project. Don't forget there is always help, by way of a pointer or two, out here.
Thanks for the encouragement Harleyjon, be another 1 or 2 weeks before I start, just finishing off another project for the wife, bTW, what does yours sound like?
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Old 29th March 2013, 02:18 AM   #12
osci is offline osci  Australia
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Hi all, I've just started building this circuit http://www.drtube.com/schematics/gibson/ga-1rt.gif
this weekend and I am unsure of the Tremolo circuit, in particular the Tremolo pot

The circuit indicates the pot is a 500K "RA" tremolo pot,

Is this pot a specific pot used in tremolo circuits?,

or can I use say like an ordinary 500K log pot?,

The circuit indicates the Tremolo pot has an ON/OFF can someone confirm this?

If it is possible to use a general 500K log pot, I have a pot out of an old radiogram with these spec's

0.5 Megohm carbon potentiometer, Tapped at 0.25 Megaohm, with a S.P.S.T. switch.

could this be suitable to be used as the tremolo control?

any input is most welcome....

cheers Ron
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Old 31st March 2013, 12:18 AM   #13
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Join Date: Apr 2010
I am not 100% sure, but I think that amp was designed as a add-on to a primary amp to give reverb and texture. You drive the reverb spring from the output of your main amp. See the schematic of this guild.

Prowess Amplifiers - Misc - Schematics - Guild T1 RVT - Guild Thunder 1 RVT


I think the Gibson was sold as a practice amp that you could use for reverb for your bigger amp as you go up in musicianship. You could try running the reverb from the output of the amp but you may get less reverb than you may want, anything more might feed back.
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Old 31st March 2013, 12:25 AM   #14
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Join Date: Apr 2010
Quote:
Originally Posted by osci View Post
Hi all, I've just started building this circuit http://www.drtube.com/schematics/gibson/ga-1rt.gif
this weekend and I am unsure of the Tremolo circuit, in particular the Tremolo pot

The circuit indicates the pot is a 500K "RA" tremolo pot,

Is this pot a specific pot used in tremolo circuits?,

or can I use say like an ordinary 500K log pot?,

The circuit indicates the Tremolo pot has an ON/OFF can someone confirm this?

If it is possible to use a general 500K log pot, I have a pot out of an old radiogram with these spec's

0.5 Megohm carbon potentiometer, Tapped at 0.25 Megaohm, with a S.P.S.T. switch.

could this be suitable to be used as the tremolo control?

any input is most welcome....

cheers Ron
The 500k RA means it is an audio pot but it has the reverse action of a regular pot. That means that it would be full on if you used it as a regular volume control and as you turn it up the volume would go down. You can use a regular 500k audio pot in its place but the action will be reversed, as you turn it up the speed will go down. The switch just takes the temolo out of the circuit, the reason for the switch is that there is only one volume for the temelo. It is either on or off.
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Old 31st March 2013, 03:04 AM   #15
osci is offline osci  Australia
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Join Date: Jan 2013
Quote:
Originally Posted by Printer2 View Post
The 500k RA means it is an audio pot but it has the reverse action of a regular pot. That means that it would be full on if you used it as a regular volume control and as you turn it up the volume would go down. You can use a regular 500k audio pot in its place but the action will be reversed, as you turn it up the speed will go down. The switch just takes the temolo out of the circuit, the reason for the switch is that there is only one volume for the temelo. It is either on or off.

Ok, thanks heaps printer......now I know what I'm looking for, the explanation you've given has made it so much clear for me.
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