Minimalist 4X6L6 100watter

[ontariomaximus]

I have decided to throw together a minimalist 100W 1997 Humble Overdraft Specimen or ODS-101-HRM or even Hybrid Rev A

What are features in there that HAVE to stay, and what can be omitted? It's all opinion but I am thinking of removing the clean tonestack altogether, resulting in PAB on all the time.

Or put another way, what is your favourite setting?

[talbany]

Do a Dumblelite w/6L's

Tony VVT

[Guitarman18]

Tony wrote:

Do a Dumblelite w/6L's

I might be wrong but I believe the reason the Dumblelite (D'lite) came into existance was to offer a D'clone in it's simplest form.

IME PAB is great with OD, but it has made for some quite aggressive and uncontrollable cleans. I certainly wouldn't go without Cl TS.

Cheers, Paul.

[ontariomaximus]

I looked over the D'lite and I think I would need the overdrive TS. So I'm leaning towards the 1997 Humble Overdraft Specimen Rev 1.2, looks pretty 'minimalist' as is.

I have 6 schematics in front of me.
97 Humble
ODS-101
ODS-101 non HRM
D-lite
ODS-101 HRM
Hybrid Amp Rev A

A LOT of differences there!

[Ed de Jager]

FWIW after last saturdays gig i decited to take out the TS altogether and make room for a dumbleator.As it is there is no room for that in my chassis.
I haven`t used the TS for too many times now.I am pretty sure i can live without it in the future.am really missing some echo/reverb though and while i think the passive loop is nice for playing at home,playing out with the boys i am losing too much.

Greetings,Ed

[Fischerman]

FWIW, when I built my 50W HRM I kinda started this way but it didn't really turn out that way.

I never installed a Jazz/Rock switch...my amp is forever in 'Rock' mode.
I installed a Deep switch but yanked it out.
I installed a Mid-boost but almost never use it...I could easily go without it.
In my amp there is a 3-position PAB 'assign' switch. Choices are Both-OFF-OD only. 'Both' turns PAB on for both channels, 'OFF' turns PAB off for both channels, and 'OD only' auto-switches PAB on for OD but off for clean. The amp stays on the 'OD only' setting about 99% of the time.

HRM controls are mounted on front panel.

I gotta have clean...I play clean a lot and I like the ODS clean tone.

I built mine with a built-in Dumbleator from the get go. 4 preamp tubes.

IMO, if you get rid of the clean tone stack then you don't even need to make it a channel switcher. You could just make it a single-channel, overdrive only amp. No relays at all.

Obv all the FET stuff can be ditched (many/most cloners do I think).

Regarding the Dumbleator...you could leave the amp as is and try a Klienulator.

[Ed de Jager]

I completely forgot about the Kleinulator
I`ll try that first.
At home i sometimes play clean for maybe a few minutes otherwise i never use it.
Perhaps with usable time effects i will use it more.The PAB is clean enough for me right now(i use the volume on the guitar a LOT,with chicken heads on the pots it is so much easier to use them than the standard guitar knobs imo)

Greetings,Ed

[briane]

pab on all the time is going to get rid of the best clean available. I would opt for pab off. If your really hurting for real estate, put the TS inside or on the back.

The olny switch really needed would be OD.

hardwire mid on, no bright, no deep, no other switches except OD. I think you need the all the pots, though OD send could be interior.

[ontariomaximus]

Thanks for your input.
I am going to build a 100W with 4x6L6's, no clean TS, HRM TS on front panel, no rock/jazz bs, no deep, etc, no channel switching. I am going to use a line out as half an efx loop (after the OD) to drive a delay pedal then into a small combo for a stereo effect - been doing that for a while, sounds superb as your main signal is not corrupted (In fact I can't recommend this stereo setup highly enough)

Should be pretty minimalist! I'll keep you posted. If anyone has any other suggestions I'm all ears.

[Bob-I]

FWIW I built a Humble Overdraft years ago and took it apart after about a year. It's not a very good schem, great attempt but we (this forum) has learned a lot since that was done.

I'd use the ODS101-HRM. Make sure to include the PAB. I personally don't like the HRM on the front panel, too easy to screw up. Set and forget.

JMO

[ontariomaximus]

Apart from the clean tonestack, there are only a few changes from the Humble to the ODS-101-HRM
-the HRM treble cap increased from 330pf to 500pf
-100k R prior to the OD master
-the rebalancing of the OD trim
-47p/470k filter just prior
-2k2 vs 3k3 rk for the 2nd stage

Not a large difference, even the clean TS is broadly similar when you strip away the deep, bright, and mid-boost.

Anybody try removing the negative feedback? How did it sound?

[Bob-I]

Apart from the clean tonestack, there are only a few changes from the Humble to the ODS-101-HRM
-the HRM treble cap increased from 330pf to 500pf
-100k R prior to the OD master
-the rebalancing of the OD trim
-47p/470k filter just prior
-2k2 vs 3k3 rk for the 2nd stage

Correct, but they may seem small but they make a big difference. Also the pramp boost (PAB) is not shown on the Humble. IMHO it's critical to the Dumble tone. My pedal is labeled "Goes to 11" for PAB and "Just won't stall" for overdrive

Not a large difference, even the clean TS is broadly similar when you strip away the deep, bright, and mid-boost.

Anybody try removing the negative feedback? How did it sound?

Yes, I have a switch on the back panel that selects 22M, 44M or none on the LNFB. It tends to add some smoothness and compression as you increase the LNFB

[Ed de Jager]

I`ve got such a switch too,like it very much.

Ed

[ontariomaximus]

Actually I was referring to the global nfb not the local feedback.

Anyone know how much (in db) the nfb?

I've heard mixed things about the local feedback - is there any consensus?

Thanks for your input.

[dogears]

Please disregard Humble. It was an early incomplete representation. HRM101 is accurate. Humble is not. It will only confuse you to even look at it.

All due respect to Mr. Ahola who was a pioneer posting Dumble schematics....

Apart from the clean tonestack, there are only a few changes from the Humble to the ODS-101-HRM
-the HRM treble cap increased from 330pf to 500pf
-100k R prior to the OD master
-the rebalancing of the OD trim
-47p/470k filter just prior
-2k2 vs 3k3 rk for the 2nd stage

Not a large difference, even the clean TS is broadly similar when you strip away the deep, bright, and mid-boost.

Anybody try removing the negative feedback? How did it sound?