Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Blind Lemon on November 03, 2011, 07:38:41 pm

Title: Brown Face Bias Vary Trem
Post by: Blind Lemon on November 03, 2011, 07:38:41 pm

Anybody suggest some more reading on this. I've done the search and read quite a bit here. What I'm trying to figure is how to slow this circuit down even slower or give it more range.

BL

Title: Re: Brown Face Bias Vary Trem
Post by: PRR on November 03, 2011, 11:20:48 pm

Post (or link-to) the circuit.

Title: Re: Brown Face Bias Vary Trem
Post by: tubeswell on November 03, 2011, 11:31:41 pm

Usually if its the standard 'fender-type' LFO circuit, increasing the size of the first coupling cap from the plate (in the RC network of the oscillator) will slow the whole range down. So if you have (say) .02uF in that first position at the moment, then try .03uF.

Title: Re: Brown Face Bias Vary Trem
Post by: sluckey on November 04, 2011, 07:04:53 am

I like changing the middle cap to change speeds, but I think all three will affect the speed, larger - slower. Also, make the speed pot bigger to decrease speed. I just put a cap on a switch to give 2 overlapping ranges of speed in this project...

http://home.comcast.net/~seluckey/amps/warbler/warbler_rev1.pdf (http://home.comcast.net/~seluckey/amps/warbler/warbler_rev1.pdf)

Title: Re: Brown Face Bias Vary Trem
Post by: Blind Lemon on November 04, 2011, 12:49:32 pm

Thanks for the replies gents.

Steve how much time you got left? Hope all is well thanks for the schem.

BL

Title: Re: Brown Face Bias Vary Trem
Post by: sluckey on November 05, 2011, 10:56:15 am

12/31/2012 unless the world ends before then.    :icon_biggrin:

Title: Re: Brown Face Bias Vary Trem
Post by: Blind Lemon on November 05, 2011, 01:19:50 pm

That got it to slow down, thx

BL

Title: Re: Brown Face Bias Vary Trem
Post by: tubeswell on November 05, 2011, 04:41:17 pm

Quote from: sluckey on November 05, 2011, 10:56:15 am

12/31/2012 unless the world ends before then.    :icon_biggrin:

(Can I ask) what happens after 12/21/2012?

Title: Re: Brown Face Bias Vary Trem
Post by: sluckey on November 05, 2011, 04:58:32 pm

That's the tricky part.

Title: Re: Brown Face Bias Vary Trem
Post by: Willabe on November 05, 2011, 05:15:18 pm

I think he might be talking abut retirement?


             Brad        :dontknow:

Title: Re: Brown Face Bias Vary Trem
Post by: sluckey on November 05, 2011, 08:58:32 pm

Yes. Blind Baby and I both work for FAA. He knows I'm a short timer. I plan to retire on 12/31/2012. But the doom sayers say the world will end on 12/21/2012. What shall I do? What shall I do?    :icon_biggrin:
 

Title: Re: Brown Face Bias Vary Trem
Post by: Blind Lemon on November 05, 2011, 11:59:57 pm

I'm hoping that there is life after 12/21/11. I'm not sure I can get it all done by then.

BL

Title: Re: Brown Face Bias Vary Trem
Post by: Willabe on November 06, 2011, 01:23:09 am

Sounds like either way you still get to retire.      :laugh:


              Brad       :icon_biggrin:

Title: Re: Brown Face Bias Vary Trem
Post by: sluckey on November 06, 2011, 09:42:04 am

Exactly! What, me worry?

(http://home.comcast.net/~seluckey/alfred.gif)

Title: Re: Brown Face Bias Vary Trem
Post by: tubeswell on November 06, 2011, 09:53:31 am

Quote from: sluckey on November 06, 2011, 09:42:04 am

Exactly! What, me worry?

(http://home.comcast.net/~seluckey/alfred.gif)

 :l2: