early 80s silver face deluxe reverb

[jaw1098]

I just picked up an early 80s Deluxe Reverb and was wondering what the volume boast on channel 2 does. How is it different from a early silver face without it, as far as circuit goes.

[jjman]

It's essentially the same circuit if you don't pull the knob. I think it's a '77-'79 if it has an original SF front.

[jaw1098]

It does have the silver face front with the fine print "pull boast" under the volume knob on the ch. 2. When applied whats going on then, is it using 1/2 of a 12ax7 for some gain?

[Firestorm]

It does have the silver face front with the fine print "pull boast" under the volume knob on the ch. 2. When applied whats going on then, is it using 1/2 of a 12ax7 for some gain?

It adds the output of the reverb driver tube to the third gain stage. Sounds awful as I recall.

[Lynxtrap]

It adds the output of the reverb driver tube to the third gain stage. Sounds awful as I recall.

Seems like it goes through the tansformer as well..? Looking at the schematics. http://ampwares.com/amplifiers/fender-s ... xe-reverb/

[Firestorm]

It adds the output of the reverb driver tube to the third gain stage. Sounds awful as I recall.

Seems like it goes through the tansformer as well..? Looking at the schematics. http://ampwares.com/amplifiers/fender-s ... xe-reverb/

Well yes, it has to. That stage is transformer-coupled like a power amp.

[jaw1098]

thanks so much for your replies and the site with the schematics.

[rdjones]

I just picked up an early 80s Deluxe Reverb and was wondering what the volume boast on channel 2 does. How is it different from a early silver face without it, as far as circuit goes.

Does yours have the "Boost Pedal" jack on the back ?

Other than the switch on the back of the pot and a 1k resistor at the insertion point the circuit is the same as other Deluxe Reverbs going back to Dec 1970.
No need to modify the amp to disable the "Pull Boost", just leave the switch pushed in.

rd

[jaw1098]

Mine does have the boast switch pedal that plugs into the back and a line/recording jack on the back. According to ampwares.com that makes it a 1979.

[rdjones]

Mine does have the boast switch pedal that plugs into the back and a line/recording jack on the back. According to ampwares.com that makes it a 1979.

Do you have the schematic for the "Boost Pedal" version ?
The only schematic I could find is for the Pull Boost version without the pedal.
I'm curious because I have a basket case 1981 DR (later Blackface) which is the Boost Pedal version.
I assume it's the same as what you have.

rd

[jaw1098]

The only schematic I got was from ampwares.com. (see above posts). The guys who replied above directed me there and I printed the schematic from that site.

[Lynxtrap]

It adds the output of the reverb driver tube to the third gain stage. Sounds awful as I recall.

Seems like it goes through the tansformer as well..? Looking at the schematics. http://ampwares.com/amplifiers/fender-s ... xe-reverb/

Well yes, it has to. That stage is transformer-coupled like a power amp.

At first, I just thought that since the boost path bypasses the reverb there was no need for it to pass the transformer either. But it's not that simple of course.