oldbluebassman
Well-known member
I have a spare 2-band EQ that I acquired on eBay some time ago. It's fully functional although it's missing the original volume pot. What's it worth?
- Thread starter oldbluebassman
- Start date
Rod Trussbroken
Moderator
What have you got there Dave.
Pre-EB (Epoxy. Non epoxy)?
EB (Rectangular board. Crescent moon board)?
Pre-EB (Epoxy. Non epoxy)?
EB (Rectangular board. Crescent moon board)?
oldbluebassman
Well-known member
This one.
Rod Trussbroken
Moderator
It's an Ernie Ball.
shlumkin
Active member
Hi there,
it's an 25K-A Type pot.
Greez, Frank
it's an 25K-A Type pot.
Greez, Frank
Rod Trussbroken
Moderator
Hi shlumpkin.
Welcome to the Forum.
Big question is what the "A" taper stood for at that time.
It can either mean Audio or Log.
But "A" was also used to denote Linear.
All 3 will work
Welcome to the Forum.
Big question is what the "A" taper stood for at that time.
It can either mean Audio or Log.
But "A" was also used to denote Linear.
All 3 will work
Rod Trussbroken
Moderator
I correct that!
EB got the volume pot designation right in the schematics... ie 25K Log.
It's the Pre-EB schematics that use the "A" designation.
I tell ya...I'll be chewing Dudleys ear at the Open House at SLO
EB got the volume pot designation right in the schematics... ie 25K Log.
It's the Pre-EB schematics that use the "A" designation.
I tell ya...I'll be chewing Dudleys ear at the Open House at SLO
shlumkin
Active member
Rod Trussbroken said:I correct that!
EB got the volume pot designation right in the schematics... ie 25K Log.
It's the Pre-EB schematics that use the "A" designation.
I tell ya...I'll be chewing Dudleys ear at the Open House at SLO
Hi Rod!
i messured it and it seems to be "A" like "Audio" 'cause it's linear.
Send Dudley best regards from Frank from Germany, I meet him last week.
Greez, Frank
Last edited:
Rod Trussbroken
Moderator
Thanks Frank,
That's what I find confusing. Although the schematic denotes an "A" taper, some pre-amps have log/audio for the vol and others have linear for the vol.
I built up a control plate assembly recently with a 1977 black epoxy pre-amp. I tried the different tapers for the vol pot. To my ear, I detected no difference between them
But anyhow, it looks like I've hyjacked Daves thread. Sorry Dave
That's what I find confusing. Although the schematic denotes an "A" taper, some pre-amps have log/audio for the vol and others have linear for the vol.
I built up a control plate assembly recently with a 1977 black epoxy pre-amp. I tried the different tapers for the vol pot. To my ear, I detected no difference between them
But anyhow, it looks like I've hyjacked Daves thread. Sorry Dave
oldbluebassman
Well-known member
No problem Gav. Anyone know what a new one costs?
Rod Trussbroken
Moderator
>>>Anyone know what a new one costs?
I think a 2 band replacement (with rectangular board) is about $50 USD. But you have to give the old one back. That's just the pre-amp circuit itself. The pots would have to be $5-10 each extra.
I think a 2 band replacement (with rectangular board) is about $50 USD. But you have to give the old one back. That's just the pre-amp circuit itself. The pots would have to be $5-10 each extra.
fighterfire
Member
- Joined
- Jan 16, 2005
- Messages
- 8
Rod Trussbroken said:Thanks Frank,
That's what I find confusing. Although the schematic denotes an "A" taper, some pre-amps have log/audio for the vol and others have linear for the vol.
I built up a control plate assembly recently with a 1977 black epoxy pre-amp. I tried the different tapers for the vol pot. To my ear, I detected no difference between them
But anyhow, it looks like I've hyjacked Daves thread. Sorry Dave
Sorry for the further hijacking...
My 89 Sabre is a 3 band and had a linear volume pot, denoted by "LIN" on the body. I put in an audio and it doesn't work so good. You get no volume until the last 1/4 turn and then it comes in abruptly. Anyone know where to get a 25K linear pot? EB still have them?
Rod Trussbroken
Moderator
>>>You get no volume until the last 1/4 turn and then it comes in abruptly.
What you've described would normally be the result of using a linear taper for the Volume rather than a log (or audio) taper.
But, your vol pot is cleary marked LIN
I've tried both tapers for the vol and both work ok
Pots are available through EBMM. They may not have the earlier lug wiring hookup types which I think yours would be. The latter pots have pins for soldering direct to the circuit board. But that's not a prob. The pins are long enough to be bent around and have wires soldered directly to them.
What you've described would normally be the result of using a linear taper for the Volume rather than a log (or audio) taper.
But, your vol pot is cleary marked LIN
I've tried both tapers for the vol and both work ok
Pots are available through EBMM. They may not have the earlier lug wiring hookup types which I think yours would be. The latter pots have pins for soldering direct to the circuit board. But that's not a prob. The pins are long enough to be bent around and have wires soldered directly to them.
