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For PA conversion to a OD/boost you suggested simply putting a coupling cap btw stages and bypassing the tone stack. The Space Heater had a 220K and 470K resistor inbtw the coupling cap and the GAIN pot which could easily be included into the existing PCB. What purpose did they serve and would...

I finally got my first build back from my tester and spent quite a bit of time with it today thru a PowerStage 170 into a conventional speaker cab. What I hadn't realized, but discovered is that I thought that if I had the Gain set on a certain level I would get the same "sound" at different...

Do you realize that your Ambassador build docs still say "Black Eye build instructions" on the page header??

In looking at the Duncan TSC I was thinking about just putting a 250K MID pot and call it a day. When max'd it gives a fairly flat curve and still has some tweakability of the Bass & Treb. What hookup mods would you do to the PCB? That might be a nice option to include in the build docs?

Question for @vigilante398, if you were to use the second PA to add a higher gain "channel" would you modify the tone stack at all? I notice most channel switching amps work off of a single tone stack with the second tube (i.e. channel) solely adding gain. Like pairing the PA with a Space...

The general gist I get is that the overhype is probably correct. I doubt you can hear any difference, but I do it cause it doesn’t cost much and eliminates any concerns that these units may be something less than serious preamps. The guy I built the “Deluxe Preamp” for has a good friend that...

Is this a boost/OD or a full blown preamp-in-a-box like the Particle Accelerator?

BTW, fwiw you can easily fit Mallory 150’s in this build. . . .

People who have heard me play would tell you that’s a good idea ;)

jimilee - From what I understand its a "show band". . . a lot of pop stuff, horns, backup singers, etc. Primarily a guitar player, but plays a lot of bass, too.

Stripped the logo from a photo and cleaned it up and then the pedal was UV printed.

Just seein' if you were paying attention ;) (ha ha). I see what you're saying. . . . Thx!! I assume I can pull that HV (full HV, not post plate resistor) from anywhere on the board?? I've since redesigned the layout so that an "HV buss" runs down one side of the board and a "GRD buss" runs down...

Just completed this build for a good friend who's a pro player. Has an extend gig playing bass in a "big band". Loves the Part Accelertaor cause it sounds great and takes up so little room on the bandstand. Asked me to build one for him. I call it "Deluxe" because the schematic is vintage...

Would appreciate feedback on the wiring of the cathode follower (the area in the RED box). Did I get it right?

Curious. . . in noting the use of the fixed 220K in-line resistor in the Particle Accelerator why 500K and not 250K? Just a little extra "choice" in the matter?

In the 5F6A thread you recommended a B500K potentiometer as a variable "output pad" just ahead of the Master Volume. The Particle Accelerator just has a straight 220K resistor to pad the output. Not the voltage divider. Is there an electrical difference btw the two approaches, could either...

Anybody up to snuff on power supplies? I hooked up my little TPA3118 amp board with just 19vdc 3A laptop power supply and IN/OUT jacks . . . no volume pot or related caps, etc. as shown in the layouts above. Talk about HUMMMMMMM?!? What I've read is that most laptop PSU's are not grounded and...

But my wife already tells me what to do?!?!?!?!? :oops:

A variable resistor, not a voltage divider. . . yes? A250K? Would my ears tell me the best output for a particular (Class D) power amp or do I want to hook it up to a oscilloscope and test for line level (3.5v p-p)?

(y) Wooohoo! Thx! BTW, if I'm wanting to run my Part Acc into a power amp do I want to create a bypass toggle for the 220K resistor there, too?