Showman Modification

[Jeff Scott]

IIRC, I'd read there were four systems always on the road to somewhere. Probably, in Blair Jackson's book.

 

[Blue]

IIRC, I'd read there were four systems always on the road to somewhere. Probably, in Blair Jackson's book.

Prob' Correct.

 

[Jeff Scott]

Have you read Blair's book? I'm not really into the GD, but his book was fascinating, and covered a lot more about the era than just the Dead.

Another, somewhat related, book is Ken Kessler's McIntosh "...for the love of music...", a superbly created masterpiece, IMO.

 

[Blue]

First I"ll need to rob a bank

 

[agedhorse]

I don't recall there being more than 2 systems and maybe only one plus a bunch of spares.

There were 2 sets of staging and scaff, because that was last out, first in, it made time saving sense to leapfrog that part.

 

[Wasnex]

I believe the F2B came first.

Here's channel 1 from a blackface Showman.

The signal goes to the phase inverter (PI) next. I'll attach the full schematic in case you want to see the connection to the PI.


Here is a schematic of the F2B

(V1B) is used to drive the output. I believe V1B provides make gain for the tone stack and is setup to buffer the output with the proper impedance. Notice the values of C4 and R9 and compare them to the equivalent components on the Showman schematic.

Here is schematic for the F1X.

An op amp is used to drive the output instead of a tube stage.

So in order for the idea to work, I believe the Showman would require a buffer circuit, switching, and either a load for the power amp or a way to turn the power amp off.

For fun, the Trace Elliot V-Type preamp is also a fairly close copy of a Showman preamp. Here is the output circuit from the V-Type. RV1 is the volume control, which is fed from the tone stack.