Solid State Earth Travler - Strikingly similar to Old Solid State Peavey Pacer?

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JHow
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Joined: 2011-04-29
Solid State Earth Travler - Strikingly similar to Old Solid State Peavey Pacer?

Hello Earth Sound Research people!

I had never heard of these until one landed in my lap last week. It had horrible motorboating and no input. I changed all the electrolytics and the two 2n3055 output transistors (one was dead) and now it works.

I looked around for a schematic online with no luck, but in looking further at the output section, it started to resemble the Peavey pacer 45W in jack Darr's book. Am I on the right track? I haven't mapped it all out yet, but the transistor compliment looks about the same: six 2N4124 NPNs, one 2n4249 PNP, one 2n5457 Jfet, a 2N5190 as a driver going into a transformer and then two 2n3055s in a "totem pole" configuration on the output. The power supply at the main filters is +35/0/-35V.

Since this thing is all discrete transistors, I'm guessing it has to be 70's? Does that sound right?

Anyhow, any info you can throw my way would be appericated.

Cheers, JHow

JHow
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Joined: 2011-04-29
Travler update

I don't know how to post pix, so I put some at the bottom of my goofy web site:

http://schematiclounge.weebly.com/earth-sound-research-travler.html

EDIT: I added a "Travler" page and included a couple shots of the "guts".

I have done a little more cleaning up to this. Here is what I have done additionally:

- used 2000uF filter caps, instead of 1000uF orginals
- replaced broken pot (it worked but the shaft had snapped, so it couldn't hold a knob, which was lost. You will see a red knob on the volume in my picture.
- speaker was also missing, so I gave it a Jensen Mod 12"-70W
- replaced crumbly rubber grommets holding on the reverb tank.

This thing sounds fine, very quiet, no hum or hiss, except for the reverb circuit, which, as you turn it up, adds a good bit of hum. It "verbs" well enough, but it is annoyingly noisy. I will see what I can do to fix that next.

Lucent
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Joined: 2007-06-17
Probably late 60's early

Probably late 60's early 70's. You are right on track with the Peavey angle. Earth was well known for directly copying Peavey designs. If you read through the posts you can find some interesting tidbits. Earth didn't just copy the designs, they used the actual board layouts in many cases. So your Peavey schematic is likely exactly what you need.

The Earth Amps scream if you can get them working. Please post some pictures so the rest of the small Earth universe can take a look. There aren't many of these left that still run. But those that do are nice.

L

foo_fighter
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Joined: 2009-02-02
travler amp

I have one of the 45 watt travler amps and I was wondering what they are worth? Everything still works. It's had a replacement speaker put in it.

Lucent
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Joined: 2007-06-17
Probably $200 - $300. Maybe

Probably $200 - $300. Maybe more if you find a collector.

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