Question for Mike Brown or other Peavey Guru

Jeremy Steele · Post by **Jeremy Steele** » 16 Jan 2001 8:55 am

I've come into possession of an older Session 400...it doesn't have a 15" inch speaker, but 2 12s (both EVs with MASSIVE magnets...talk about HEAVY!)...anyway, there's a female 1/4" jack on the back labeled "boost"...can you tell me what it's function is? Thanks.

Donny Hinson · Post by **Donny Hinson** » 16 Jan 2001 1:39 pm

If I'm not mistaken, the "booster" jack is basically a "preamp out" jack that's used to drive another power amplifier. The signal here is probably around a volt, so it's too high to run into a preamp, or the regular input jack of another amp, and it's not high enough to drive a speaker directly.

Bill Crook · Post by **Bill Crook** » 16 Jan 2001 2:15 pm

What Donny said......

Dan Tyack · Post by **Dan Tyack** » 16 Jan 2001 2:49 pm

I wonder if that's my friend Mark Cohen's old amp. Are these the EVs with the huge white magnets? (SROs). Does one of them have an aluminum dust cover like a JBL?

That is a great combination (the session with EVs). I used my old Session with a JBL in addition to his amp once with the New Riders. It was almost loud enough with both amps on 5

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Jeremy Steele · Post by **Jeremy Steele** » 17 Jan 2001 6:20 am

Dan, they're definitely SRO's (I used to have a pair of "Eliminators" with the 15" version) but both dust caps are black...I agree that the amp sounds great with them.

Mike Brown · Post by **Mike Brown** » 17 Jan 2001 7:03 am

The BOOSTER OUT jack on a '70's Session 400 amplifier is stepped down off of the speaker output in the power amp section. A PRE AMP OUT signal is taken from the post gain control on most of our amplifiers that we manufacture today.

In both applications, the idea was to route the preamp signal to a device such as a power amp that can be driven with a nominal 1 volt signal.