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These beauties arrived today, I now have all the PCBs needed for the 10 kits. The prototype transformers showed up last week. I'm using my Mark III blue stripe to test the transformers, documented in this thread - Mark III HRG Blue Stripe -> DRG No Stripe Conversion. Hopefully I'll be...

If you want the color and sound of the Mark IV power section and graphic EQ, you need to load the Mark IV. Taking the signal from the slave out port will work fine. In this scenario, the channel volumes, master volume, and the slave level will all be useful to control volume. The presence...

Welp, had my first meltdown with this thing. As you can see the fuse holder didn't survive the demo and prep. Took this as an opportunity to order a replacement along with some other parts I'll need for the project. Going to be a few days before everything gets here so finding other stuff to...

After some thinking and experimenting, I've convinced myself the purpose of the mystery screw is to offset the OT core from the chassis so that it doesn't pick up any flux transferred from the PT via the steel chassis. I don't believe it needs to make contact or ground some core laminations. I...

Found something interesting.. Next step was to remove the output transformer. Here is the new simul OT (left) next to the removed 100W Boogie transformer. The removed transformer was labeled 562100. The core was the same size as my IIB HRG OT that's labeled T100-152019. The primary...

First order of business was to remove the power supply card and add more of the 220 uF caps

Pulled the chassis, no indication that this had ever been opened before. Pretty neat! Also realized that it's going to take some doing to get the PT out, more demo than I had expected but not a huge deal

I have a pristine Mark III HRG hardwood combo on hand that I don't get along well with. It's more compressed and squishy sounding than I care for. I'm not sure whether it's due to the wimpier power section or preamp differences, maybe both.. Even though it has the EV - 12L speaker, I don't use...

Thanks for grabbing! Can you please confirm that there are only four inside?

Can you post some better pictures of the center two output tube sockets? I don't know these amps very well, but wondering if it's a KRG rather than a KDRG? Also, not sure if you noticed, but some of the tolex got caught on the amp chassis by your pilot light during install

I do still have a couple preamp PCBs left from the last run, this is the only board needed to convert a IIB to a IIC+. Shoot me a PM and I’ll send you the info

You could try reaching out to Belton, but I'd guess they'd only sell large quantities. I've never seen tank components for sale, likely because the units are cheap. You could also contact someone like Hammond MFG for custom transducer fab if you have specs.

Should be receiving the prototype transformers soon. Still don't have final pricing, but looking like it will be at least $1500 + shipping per kit. Tentatively, the first round of these kits will come with: Chassis + special parts mated to chassis (i.e. IEC inlet, fan receptacle, pilot light)...

Have any pictures of the circuit board?

You got the idea. The plates may be sitting at 350V WRT ground at idle, and the bias might be -60V on the other side so the voltage across the cap would be 350 - (-60) = 410V at idle. Then during transients you’ll see an additional 60V across the cap if you’re running at full power. The film...

Boogie swaps these with 600V because they tend to fail, no need to change them unless they’re leaking. At idle they do not exceed 400 VDC, but the transient voltage across them will exceed 400V. Remember, the voltage across them will be the anode voltage with respect to the power tube grid bias...

Boogie swaps these with 600V because they tend to fail, no need to change them unless they’re leaking. At idle they do not exceed 400 VDC, but the transient voltage across them will exceed 400V. Remember, the voltage across them will be the anode voltage with respect to the power tube grid bias...

Hey Ed, I do not have any preamp PCBs compatible with a Mark III chassis at this time, only for a four tube Mark II

Hey Ed - I have a couple leftover preamp boards from the last run, PM me if interested

The wiring diagram that I was referring to may be what you'd consider a layout, so plan as of this moment is yes. Yes it will be capable of reverb, a tank will not be supplied but they are available from Boogie. The 125V tap is for either people who have high wall voltage such as myself, or...