No one has mentioned the layouts that are under "Docs"
I see the HRM and the 183 contain EL34 valves.
Perhaps someone with more understanding could spot any other points with the components?

Tone

there's been one on UK ebay for weeks, only £400 now
was £600 with combo case + century driver + empty head cab

My custom isolation cab has been completed and delivered.
It's designed to look as good as furniture, and contain three 12 inch speakers and a mic for each
When I record in my homestudio, I prefer to do it this way rather than mic up and use headphones

The Outer shell is made from solid Oak, other than the base, and an extra layer of MDF under the oak top.
Then there is hemp insulation, and then an inner mdf box, lined with thick carpet and foam
Intentionally, the "mini-cabs" inside (i.e. the speaker supports) are not coupled to the case, but rest on the carpet.
Since the "mini-cabs" have no back and side, phase cancellation means there is little bass in the room if you use them as a cab, but close-mic'd they are fine

The main problem with the cab has been the weight, and in use ensuring the mic cables don't touch anything since that can add a weird distortion effect.
In use, with a 50w amp full-out, you can hear a little bass escaping, but the output transformer windings on my DZ30 and TW Express make more noise. Certainly quieter than an unplugged strat

Before this I've been using a Randall ISO 12C, which makes too much noise to use in my home studio, but records well - but with one driver you can't match every amp.

Thanks to Ed Lewis for developing my initial plan into something real
Initially I thought to have "mini-cabs" with sides, but Ed realised this was not necessary.

Care is needed to not touch the mic cables on anything that vibrates

All working well - just waiting for a Celestion Gold to put in it

I also find lots of FX are far too noisy
but you have checked everything I think

are you running the amp and FX on the same phase of your mains power?
i.e. from the same wall outlet

Sounds interesting
I can't really judge it from the audio in that video
My favourite sound on the JTM45 is my strat neck pickup , Treble #1 input, set to vol= 7-8
I get this lovely touch sensitive zone
With humbuckers & turned up to 10, the grit comes too, but that 7-8 strat sound is my favourite

Can the 6v6 amp do that?

Cheers
Tone

my DZ30 goes into crunch before 9 o'clock on the EF86 channel with any EF86 valve
I thought why not try Using an ECC81 as Phase Inverter

it sounds clearer low down and I can still get into crunch by 11 o'clock

is this safe for the amp long term, and has anyone else tried this?

Cheers
Tone

The OD on my BM (2 months old) is very bluesy for me with my strat

I run the preamp clean on 4, master 7: my OD settings are 4 and 5

You're quite right, I would not bet much money on guessing which amp was used for a recording.
The feel would vary of course
My real opinion is that if you need that range of sounds, taking 2 amps is the best way, otherwise you'd be looking for a multi-switching PCB amp.
I'd be happy with an HRM BM and a DZ30

To make do with one amp for clean and crunch, I think I'd go for JTM45 - it does the Fender thing, then the early Marshall thing, adding an OD pedal may be the answer. The Trainwreck Express can do this too, but you have to put some lower gain preamp tubes in to get the cleaner tones, and the heavy end is 1980s rock
There may be some combination of pedals that can help any of these amps, but it's too personal to guess what will work for someone else.

For the OP:
make sure you get a separate head and cab. It's much more flexible and as time passes your back will thank you. 30kg combos are dangerous for backs.
Also it's cheaper to ship heads from Malaysia and source a cab locally.

On my HRM BM, the deep switch is wired the wrong way up. Recent posts say this is a mistake in the schematic, and everyone has the same issue - just check which way is really on.  Which model do you have? I thought the standard did not have a deep switch

I just do studio stuff with mine, I've occasionally used a Carl Martin Quattro and EHX Cathedral with it though. I only just got these after renouncing pedals for 10 years, so I haven't heard of your ones
I find teh BM does Fender Twin sounds quite well, and having the deep switch off lets me lost the excess bass when using a neck pickup
Aside from that, I think light use of the OD adds a little grit, nice on bluesy stuff, but it's not power-amp OD. I think You can do the Santana sound too.

For a full range of sounds for varied live work, I don't think any amp really delivers. Having a Twin-relation as a blank canvas and using pedals is a fair approach
After all, the OTS amps are not magical, they're just a clone of a modded Fender Twin really, with built in (valve) fuzz that sounds clearer and warmer than fuzz boxes.

For the way you are saying you use the amp, a JTM45 might be nicer for the crunch, I was amazed how much I like the one I found. I always thought I was a Fender/Vox guy. To get more or different crunch you could use EL84s via THD yellow jackets, but I didn't liek the sound when I tried them in my Twin

I mention it since the OP asked for
Clean tone: John Mayer, Robert Cray, SRV, John Frusciante, Eric Johnson, Jimi Hendrix
they mostly sound like Fender territory (or a JTM45 run clean)

cheers
Tone

have you got it set to rock or Jazz?
I think the PAB EQ is intended to work as a lead boost, probably especially for single coils

I probably use this amp differently to most people, so there will be other tones. I did not get it to copy RF or LC
I also have the Fuchs ODS (with no HRM), and although the clean sounds are different, the OD is similar.
I just use the HRM to smooth off the treble on the OD, otherwise you need to change the clean preamp EQ to change the OD - and not as effectively

They are tricky amps to find your favourite settings
not sure what you meant by 15 o'clock,
Seems a shame to use PAB constantly. It gives a mid-boost and bass cut which it sounds like you are remedying with the deep switch, and you lose all the EQ control permanently
Why not just crank the preamp up more?
I like it clean when pedal is off, which is 5 on my HRM BM50, and 7 or 8 on the master vol. Then I add boost/OD with the pedals
The OD is hard to get right. I use both on 5, and the trim on about 11 oclock, but I don't add much OD. I think the OTS D-styles sound best with just a touch of OD, since I think it's closer to a fuzz tone, anything more sounds nasal to me, so I can see why for heavier OD you prefer the clean channel

I have a heretical opinion which is that new kit is almost always the best idea.

Almost all guitars are made better nowadays. Whenever I've picked up old expensive guitars, most were expensive, and no easier to play, if not worse  - the technology of construction has moved on a lot. Some old guitars are great, many are poor, and I don't have the money for the nice ones.
When I was a kid £150 got you a beginner's strat copy with a poor neck, 30 years later it's the same price (way lower in real terms) for a much better guitar.

With amps, the prices for vintage gear is less silly than with guitars, for rare amps it's still crazy, but I ask myself "how do I know it's authentic, and why buy 40 year old electronics, or rare amps from a one-man-operation, when someone is building brand new ones to the same spec or better? I know it would be nice to buy a rare old amp, but I sold my 1960s ac10 twin and fender tremolux years ago, since I felt I could get twice as many pieces of reliable modern kit with the money

My main rule is to try to mostly buy kit that I can sell on with little or no loss. With Nik's stuff I make an exception, since how else would I get these rare or overpriced amps? Even then, the OTS amps seem to hold value quite well.

so this is much closer to the JTM45 sound and feel than the EL84 amps?
Certainly the Cornell 18/20 I own sounds quite different to my JTM45

Does the EZ81 supply the power in the same way as in the JTM45 (i.e. same balance of sag and attack). To me the JTM45 has very fast attack for an old amp design's tube rectifier
I ask since the Cornell 18/20 I own sounds very soft on the tube rectifier, and I often need to use the SS rectifier

So I suppose I'm asking - does it really sound like a JTM45 and does it need switchable rectification if made with an EZ81?

Cheers
Tone

I rarely put pedals between me and my nice amps.
However, sometimes it's fun to use FX for a change or for a specific sound

I find it really hard to get pedals that don't completely wreck the tone of any good amp, even when switched off

A few have true bypass, but even then you need to be sure the effected sound is not messed up

Anywaym I feel like playing with a very light phased effect occasionally

Any recommendations?
It needs to not trash the tone when on, and do nothing when off