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Setting the gain of Jeff Rowland Model One

151.70.17.31
Posted on July 22, 2014 at 23:13:24
gionabolle@gmail.com
Audiophile

Posts: 5
Joined: July 22, 2014



I want to set the gain of my Jeff Rowland Model One amplifier.
I have removed the driver module from the main board. As described in the user manual, the back of that module shows some sockets meant for jumpers (see attached picture).
Unfortunately I don't know how to place those jumpers to set the gain at 20, 26, 29.5 or 32 dB (the values indicated in the user manual).
Can anybody help me?
Thank you!

 

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RE: Setting the gain of Jeff Rowland Model One, posted on July 23, 2014 at 07:02:17
jsm71
Audiophile

Posts: 1123
Location: Cincinnati OH
Joined: June 16, 2011
 Have you tried contacting the company directly? They should be able to provide your best guidance.

 

As others have said, I'd contact the MFG, but..., posted on July 23, 2014 at 14:32:24
David S.
Audiophile

Posts: 3552
Location: Mountains of WNC
Joined: August 31, 2000
 Sure, I'll give it a simple guess - there are 4 possible gain settings, and given the 4 sets of aligned holes, I would ALMOST bet they are arranged such that if the jumpers go between the first pair, the gain will be 20, between the 2nd pakr, they'll be 26, 3rd pair for 29.5, and last pair for 32.

Of course, I could be horribly wrong, and that may well by why the Owners Manual says they gain should only be changed by an authorized dealer.

I don't see ANY jumper in the photo, so I'd ask - if there had been one installed, how was it placed?

 

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