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I usually never post here in the classifieds but I thought this would appeal to someone. I just went through it and it's stage/studio ready. It's an absolutely great sounding amp. Sorry ahead of time because it's technically not built by Mesa. Hope I don't offend anyone. Anyone here interested...

I have a few NOS Teledyne 1009 Fetron's. These were bought new from Boogie many moons ago while they still had alot left. P/M me if interested. J-

:D

The only safe mismatch on a tube output section is if it sees a higher load.

That sounds like a voice coil rub in the speaker. That Celestion is probably on it's last leg.

agreed. i meant the board would have to be lifted as oppossed to getting the socket in any other way. i like to free the board from all the standoffs as to not put any strain on the traces. shouldn't have to un-solder anything in any case.

Mark III Board w/o Reverb Mark III Board w/Reverb Easy as pie to add verb to this amp. Besides populating the board around V4, and adding the usual suspects, tank, tranny, pot, RCA jacks, etc...., you'll have to lift the board to get that new tube socket in place.

Mark series amps don't have a cathode follower. Nonetheless, the Tung Sol 12AX7 has a high failure rate on the filaments. In some cases they will start to hum withing a few hours of installing them. I'd recommend almost anything else besides them.

This is not consistent and therefore not good information. The earliest Mark I's didn't have a jack under the chassis. The jacks started appearing as custom orders and were wired according to the customer request. I've seen the jack under the chassis wired for the following uses: Pre-Amp Out...

If the Dyno-label has fallen off, there are still several ways to date it.... Most chassis have a handwritten date on the underneath when it was at it's final inspection Transformer codes are another, although Mesa often used transformers spread out over a long manufacturing run in some early...

Looks like someone put a variable pot in series with the Boost circuit. If you can take close-up shots of the back of both pots showing the lugs I can confirm.... That's a novel idea nonetheless. With the addition of the effects loop send and return you theoretically wouldn't need the factory...

You have to check the current draw(bias) when you replace the power tubes regardless if they're Boogie tubes or not. Mesa won't tell you about all the returns they take with their precision matched and bias rating system tubes. It's kind of run away with itself at this point. Example being, if...

It's only a marketing tactic. The EVM only came in 2 power handling versions spread across 3 different baskets, 200w and 300w, those are conservatively rated. Series I, Series II and the Pro-Line all were used by Mesa at different times. The speakers could handle much more wattage than their...

Can I see a picture of the back of that head? It looks like a head I serviced and sold last year....

Unlike later Mark I's where the Boost was tied directly to the tone stack, the Normal/Boost feature on this amp is really just a 100w/60w switch. It's tied directly to the cathodes of the center pair of power tubes. Normal is 60w and Boost is 100w.

Yeah, it ended up being a sweet playing amp. Pure original Boogie tone. From a tech point of view it's simply a blackface Fender with a rewired preamp. The power section is note for note blackface fender circuit with the exception of the power tube grid resistors(2.2k instead of 1.5k) and the...

Reverb transformers on Mark III's are known to overheat and cook themselves out. The distorted tone when you turn up the reverb is a dead giveaway. Replace the transformer and increase the value of the dropping resistor to the primary coming from the B+ rail.

I gut the Boogie dual cap config and I use a straight up Fender bias supply. I use a 10K pot in series after the diode and cap. One outside lug of the pot has a 27k resistor to ground, the other outside lug has the neg bias voltage from the diode, the wiper feeds to the 220k split.... bias...

That, my friend, is not useless trivia, that is just plain badass. ;)

All Mesa Boogies have to be plugged into an AC outlet to work. :roll: