Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: bnwitt on September 05, 2016, 05:19:45 pm

Title: LED in Hoffman AB763 bias vary tremolo?
Post by: bnwitt on September 05, 2016, 05:19:45 pm

Has anyone replaced the R/C components on the Hoffman AB763 V5-A Tremolo Oscillator with an LED?  If so does it work/do anything to the strength of the oscillator?

Title: Re: LED in Hoffman AB763 bias vary tremolo?
Post by: shooter on September 05, 2016, 05:23:56 pm

Quote

do anything to the strength of the oscillator

I did it with a Gibson trem, took it from mild mannered to ballsy and brash, the musician types liked it

Title: Re: LED in Hoffman AB763 bias vary tremolo?
Post by: HotBluePlates on September 05, 2016, 07:06:51 pm

Sluckey has and reported it strengthens the oscillator output.You essentially have perfect bypassing down to d.c.

Title: Re: LED in Hoffman AB763 bias vary tremolo?
Post by: bnwitt on September 05, 2016, 07:25:36 pm

Thanks for the replies Shooter and HBP.  Looks Like I'll be giving it a try.  The player I'm building a BFDR for wants that strong Ry Cooder Tremolo tone.

Title: Re: LED in Hoffman AB763 bias vary tremolo?
Post by: HotBluePlates on September 06, 2016, 10:00:12 am

Quote from: bnwitt on September 05, 2016, 07:25:36 pm

... The player I'm building a BFDR for wants that strong Ry Cooder Tremolo tone.

I wonder if Cooder used a small amp which injects trem at a preamp cathode, like a VibroChamp.  They certainly get swampy trem...

The tweed Tremolux gets a swampy trem as well.  I don't know your appetite for building experimental amps, but it seems you could graft a blackface preamp to the tweed Tremolux paraphase inverter & output section.  Or the player could use an EQ pedal to scoop mids if a tweed Deluxe/Tremolux isn't the right sound.

Title: Re: LED in Hoffman AB763 bias vary tremolo?
Post by: bnwitt on September 08, 2016, 01:29:57 pm

I did a little research on Ry Cooder's equipment and he has lots of amps and guitars.  The vibroverb and tweed deluxe were amps he had on stage at a few performances:

http://www.thegearpage.net/board/index.php?threads/ry-cooders-backline-on-october-3-2008.448912/ (http://www.thegearpage.net/board/index.php?threads/ry-cooders-backline-on-october-3-2008.448912/)

He supposedly uses an outboard compressor somewhere in his signal chain and he has a little tube preamp built into a variac body for feeding the BFVV and Tweed Deluxe as well:

http://www.rycooder.nl/pages/ry_cooder_Instruments_gear_amps_effects.htm (http://www.rycooder.nl/pages/ry_cooder_Instruments_gear_amps_effects.htm)

I'm putting a middle control on this BFDR's tremolo channel as I always do with black faced Fender amps as I just think not having one stinks.
Barry