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Not in mine.

The TCR508 FET is acting as a diode in this implementation. It is there to provide a constant current source through the nominal range of the device. The Limit is a pot in series which reduces the regulated current to starve the tube. Not uncommon to use a FET with two legs joined for this very...

The pot on the limit control is a variable resistance. As the pot adds resistance, the current limiter is made less relevant. If the diode and pot are replaced by a fixed resistance, the pot can by used for another function, such as presence.

The TCR 5305 in the schematic is the current limiting diode I mentioned. In my amp, “Presence” was wired as “Limit” as I mentioned, with a potentiometer wired in series with the diode. A service hack that Mesa is said to have endorsed is swapping the diode for a 1k5 resistor on the cathode of...

Better late than never…but… IIRC, the “Limit” pot introduces variable resistance in series with a FET acting as a diode that clamps the current flowing through the driver/PI cathodes. As the resistance rises, it swamps the effect of the FET and starves the driver/PI so that it becomes...

I harbor no regrets, but miss a few. 74 Gibson Les Paul Custom. Did midwest regional tours with that 79-82. Sold it to buy my friend and manager a 60s Gibson EB3 bass so he could get his Felix Papalardi on. 91/2 PRS Custom 24. Toured that from Cabo to Juneau for a few years on the I-5...

If the cab case will host a V35, I will buy them both. I need to relocate a V35 from MA to SoFL, so seek a used ATA case for my V35 combo to move south. I'll likely flip the head case to recoup. Unless another BB-er will go ~halvsies with me. Many thanks for the info. Cash in hand. Rik

Craigslist score. Between the neo speaker and this cab, I made cartage work way more better(er). Gotta keep touring costs down to make it work for regionals...

It sounds and feels like a blackface Fender Bassman with a stiffer power supply. I happen to like that. I run my SOB into a Freyette Power Station in channel 2 with the gain nearly maxed. Mine has the "limit" feature, which I do not use. I run a delay in the loop of the Power Station. Rehoused...

OK! Amp arrived well, dialed in a couple core tones at the northern home base tab low volume levels and was out 6 hours later. Did 3 loud sets and tweaked settings as I ran out. Pretty easy ride, as I only really needed a dynamically responsive and bouncy clean tone and a liquid lead tone for...

The 5:35 cab is a tight fit for the footswitch, but the V:35v FS is smaller than the Mark V FS. I manage with the V:35, but it is not wonderful.

This is the daily driver: '73 Strat hardtail with a bridge bucker SOB rehoused in a pine combo cab with an Alessandro neo 16 ohm Freyette Power Station to match the 16 ohm speaker to the 8 ohm amp and to provide a post-OT effects loop The loop has a Suhr MiniMix with an EQD Dispatch Master in...

^^^ Nice guitar! What is it? Hey, do you use your limit? I haven't found it to be useful, especially since I play my SOB wide open (ch 2 vol 6-7, master dimed) into a Freyette Power Station to dial it to the room (no attenuation in the rock bars and for sessions, choked back a few clicks for...

Psyched! Pairing this with an axe with a neck Firebird mini-hum and a bridge P90. This one is for work with an African rock band a couple thousand miles north of my usual gig. Leaving it at the place I live in up there and will commute from down here for shows. Auditioned several amps looking...

This one is winging my way. Just in time for my birthday. Hot rats!

i picked up an Alessandro/Eminence neo 12 and a home brew pine combo cab for my SOB. Did a little repair on the power supply, popped the chassis in the new cab, hooked up the new speaker, and I now have a gigmeister combo that is 37.8 pounds and gets whats I likes going on for the Taxachusetts...

Word. The seller told me that the guy that did the work makes his own amps, but is "impatient" about repairs. I'd love to have a better schematic of the SOB and a layout. Failing that, I am likely to draw mine own up from what I see and from photos. Considering swapping in Solens ("fast caps")...

Some pics (weird how they got flipped between Picturetrail and da Boogie Board! Look fine when I open on the hosting site...):

As a long time lurker, I sought information about 1x12 combos that would be suitable for my regular out of town gig, 1.5 kilomiles north of my usual haunts. Found one and signed up to post about it (and other stuff). Here's my notes and some pictures: Mesa Son of the Original Boogie Arrived...