Most advanced Marshall worth a turret board build?

[V-man]

50-50 elements here and workbench, I opted for the larger traffic stream.

I was thinking about an obsolete circuit or two you can no longer reliably source replacement boards for and was curious about this subject.

I am sure for a grade at MIT, views & subs on a monetized channel or some other purpose that rewards excess to the point of absurdity, a JVM or beyond could probably be recast in P2P form, but there has to be a law of diminishing returns in terms of practicality (time and expense).

I would confidently state the floor would at least be the 25/50 to JCM 900 series with the SLX being easiest and the 2555/4100 models being most difficult. 900 boards being a thing of the past, I can see it feasible, even practical for a hobbyist/builder to attempt a hand-wired SLX. As for JCM 2000 and beyond, I am not sure where the complexity/cost or even feasibility diminishes to “lost cause”

Any ideas?

 

[2L man]

Silver Jubilee 2555 does not look difficult to hand wire but naturally it take time. When chassis is large it is possible to do more complex circuits.

4100 schematic I found has OP-amps and I would not spend time using them with tubes.

 

[StingRay85]

The 2203/2204 is probably the last iconic model worth doing P2P. But it's not more complex than SL or SB

 

[Central Scrutinizer]

The 2203/2204 is probably the last iconic model worth doing P2P. But it's not more complex than SL or SB

This.

Personal preference for me would be a later JMP circuit. Just because I’m old and JMP speaks my language.

 

[Leonard Neemoil]

I'd LOVE a PTP DSL 40C or 100H!

 

[anitoli]

PTP 6100? Whoever could do that would be a frigging genius and also have a head case the size of a Snap on rolling tool box..................

 

[V-man]

The 2203/2204 is probably the last iconic model worth doing P2P. But it's not more complex than SL or SB

I think from a (current) practical point you are right.

Had the SLX gained more popularity though, I could easily see that being a candidate… same story with the Vintage Modern, but the moment of them having widespread exposure/demand to make your own (as opposes to buying used) is probably in the past.

 

[mickeydg5]

Point to point is difficult when relays and chips are involved but not inconceivable to adapt.
It may however look strange.

Anything is possible.

 

[Leonard Neemoil]

Point to point is difficult when relays and chips are involved but not inconceivable to adapt.
It may however look strange.

Anything is possible.

Function over form.

 

[StrummerJoe]

Turret board is NOT "point to point" people.

 

[mickeydg5]

Function over form.

No one truly understands this.

 

[mickeydg5]

Turret board is NOT "point to point" people.

I consider a turret board as an organized point to point.

 

[StrummerJoe]

I consider a turret board as an organized point to point.

Here are the guts of my BC Audio Amplifier 8



THAT is organized PTP. Wired by Bruce Clement, the BC in BC Audio.

 

[StrummerJoe]

Sorry for the temporary derail, I was just pointing out that Turret Board is not the same as PTP.

PTP by definition excludes the use of turret boards of any kind...just like PCB isn't turret board.

 

[mickeydg5]

Here are the guts of my BC Audio Amplifier 8

View attachment 146764

THAT is organized PTP. Wired by Bruce Clement, the BC in BC Audio.

So you are saying their costume ptp is not ptp just like a turret board?
I am sorry but point to point is by wire, by component, by turret, by board or anything else. It is a play on words.
The only differences are the components and means.

Technically, it is all point to point. A mother board full of processors is point to point.
Please understand that.

 

[Leonard Neemoil]

Turret board is NOT "point to point" people.

Correct. I ALMOST wrote turret board in my reply too, but the two are used interchangeably so often, I didn't.

Either are better than a pcb imo.

 

[StrummerJoe]

Correct. I ALMOST wrote turret board in my reply too, but the two are used interchangeably so often, I didn't.

Either are better than a pcb imo.

PCB done right is just as valid. PCP done cheaply is where it gets a bad rap.

So you are saying their costume ptp is not ptp just like a turret board?
I am sorry but point to point is by wire, by component, by turret, by board or anything else. It is a play on words.
The only differences are the components and means.

Technically, it is all point to point. A mother board full of processors is point to point.
Please understand that.

No it isn't.

But in the end the electrons don't care. If you care to discuss it further, we should do it in another thread.

 

[TassieViking]

PTP seems ok until you have to fault find someone else's builds.
Give me a nice neat turret layout or a PCB anytime

 

[StrummerJoe]

PTP seems ok until you have to fault find someone else's builds.
Give me a nice neat turret layout or a PCB anytime

Yeah, that looks like old school PTP, which could be a total rats nest. Manufacturers switched to turret board because it was faster to wire and fix.

All methods are valid when done with quality components, IMHO.

 

[playloud]

Ceriatone do a Silver Jubillee with plenty of space left in the chassis:



In a similar vein, there's the Wizard MC100, which uses those long Sprague axial caps and still gets away with it:

This Larry Dino has plenty of relays:

I think if you use narrow turret boards, stand up transformers and radial caps, the JVM is probably doable - the question is whether you'd bother (I wouldn't). Personally, I'm more interested in builds that go the other way - stripping the circuit down to its bare essentials (a good example being how Ken Fischer co-opted the AC30 top boost circuit for his Rocket).

Some day, I'd like to make a plexi clone with a front panel that has only a power switch, an indicator and a single input jack...