Brown Note ODF-100 trimpots.

[Blix]

I have a killer sounding BN ODF-100 and while opening it up for checking the bright cap value on the mv, I noticed 4 trimpots on the main circuit board, which you can see in the following photo's:


[img683]http://farm5.static.flickr.com/4078/486 ... 29b1_b.jpg[/img]
[img683]http://farm5.static.flickr.com/4137/486 ... b24f_b.jpg[/img]

Anyone have an idea what they can be? I have tried to email Moss several times for more info on my amps build, but he doesn't answer...

[martin manning]

I have a killer sounding BN ODF-100 and while opening it up for checking the bright cap value on the mv, I noticed 4 trimpots on the main circuit board, which you can see in the following photo's:
Anyone have an idea what they can be? I have tried to email Moss several times for more info on my amps build, but he doesn't answer...

Nice looking amp!
Left-to-right:
1) Phase inverter balance
2) Presence control (is there one on the front panel?)
3) Treble bleed at the output of OD stage 2
4) Drive level for OD stage 1
My put based on knowledge of the basic D-type circuit and the photo. No direct experience with BN.

[Blix]

I have a killer sounding BN ODF-100 and while opening it up for checking the bright cap value on the mv, I noticed 4 trimpots on the main circuit board, which you can see in the following photo's:
Anyone have an idea what they can be? I have tried to email Moss several times for more info on my amps build, but he doesn't answer...

Nice looking amp!
Left-to-right:
1) Phase inverter balance
2) Presence control (is there one on the front panel?)
3) Treble bleed at the output of OD stage 2
4) Drive level for OD stage 1
My put based on knowledge of the basic D-type circuit and the photo. No direct experience with BN.

Ah thanks.
More info/pics on the amp, and yes presence on the front.

[img:640:480]http://farm4.static.flickr.com/3474/464 ... 10b4_z.jpg[/img]

[img:640:480]http://farm5.static.flickr.com/4050/464 ... dac6_z.jpg[/img]

Front switches are 3-position bright switch, mid and bass.
Switches on the rear are od, midboost and PAB.

[martin manning]

More info/pics on the amp, and yes presence on the front.

..Then 2) is more likely a variable feedback resistor to adjust the level of FB. Should have come to that conclusion the first time!

[butwhatif]

If i might ask, what's the value of the treb bleed cap in your amp? thx jerry

[Blix]

If i might ask, what's the value of the treb bleed cap in your amp? thx jerry

Sure, it was 47pf.

[butwhatif]

On the output of v2b? the poly cap there is too physically large to be 47pf--- must be .001 or .002 ?

[Blix]

On the output of v2b? the poly cap there is too physically large to be 47pf--- must be .001 or .002 ?

Sorry I'm not too technical, but I was referring to the cap on my master volume, as seen here(the inside one)
[img713]http://farm5.static.flickr.com/4115/487 ... 52a0_b.jpg[/img]

If you want to know the value of something else, I'll find out, but you have to tell me where to look.

[Structo]

Are both those cerami caps on the bright switch 47pf?

If so then the total value is 94pf.

But it looks like the one in front has different writing on it.

[Blix]

Are both those cerami caps on the bright switch 47pf?

If so then the total value is 94pf.

But it looks like the one in front has different writing on it.

The second one says C0 22J on it, if that tells you something.

I guess it means the value is 68pf then.

[butwhatif]

that's the bypass cap-the bleed is on the board, next to it's trimpot

[Blix]

Ok, forgive me my ignorance here, while I try to educate myself a little.
That master volume pot have a pull bright switch, and I guess that why those caps are there. I have no use for that bright switch really.
Could I rewire it to do a "bright cap" function on the master instead.
Or as I don't need the bright switch, I could easily move the caps over to the viper on the pot though, and disabling the pull function...
Hmm, decisions decisions...

Some input on this will be appreciated.

[Blix]

that's the bypass cap-the bleed is on the board, next to it's trimpot

Aha I get it. It's a .001

[butwhatif]

I would keep the functionality you have, but if it's a pia then bypass it, or you could have a permanent byp of the sound u normally use, and an extra bright on the switch--

[Bob-I]

Ok, forgive me my ignorance here, while I try to educate myself a little.
That master volume pot have a pull bright switch, and I guess that why those caps are there. I have no use for that bright switch really.
Could I rewire it to do a "bright cap" function on the master instead.
Or as I don't need the bright switch, I could easily move the caps over to the viper on the pot though, and disabling the pull function...
Hmm, decisions decisions...

Some input on this will be appreciated.

I think you have the answer to the trim pot questions.

As for the bright switch, if you don't use it, and if you're happy with the tone of the amp, just leave the switch off, don't change a thing. I wouldn't move the caps to the wiper, that would put the bright on all the time, which you said you have no use for.