PTP/handwired/amp build

ejkennedy

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982
Looming for a little clarification. Saw someone mention that some hand built amps aren't actually" true PTP" builds because they use turret boards or something along those lines. Just curious what that's about. Maybe I'm wrong. Or misread it.
 

big mike

Cathode biased
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13,421
That's correct.
using a turret board is just that, turret board.

TRUE handwired point to point essentially has all components flying in the chassis.

 

wyatt

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4,167
It's kind of become a colloquialism; people now say point-to-point when they are referring to non-automated, non-PCB amps. Mostly because that's how they heard it and they don't know the different methods of construction.

Turretboards, eyelet-boards, terminal strips, flea clips, etc. are all different types "tagboard construction." The components are connected via some sort of solder lug and there are often flying leads used to connect the boards to tube sockets, pots, etc.

Point-to-point has to components all connected directly to one another, as in Mike's example.

It's important to know the difference when discussing the nitty-gritty in technical conversations, but it's really hard to prove a sonic benefit of one over the other. Still, true PTP seems to be the status quo in the tube hi-fi DIY world.
 
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^The above posts are correct. And to add to it...it's important to understand that no one method is superior to the others. True PTP can often be harder to make consistent, compared to turret/tag board construction.

Consistency, noise floor, serviceability, ease of construction, cost, and reliability are all factors, among other things. Also, one off builds are totally different than mass produced amps (even small runs from boutique guys).
 

fusionbear

exquirentibus veritatem
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Here is a example of two builds i recently completed:

PTP:




Turret Board:



Either one cab be done well or messy...

Just like some PCB are awesome and others a noisy mess...
 

drbob1

Gold Supporting Member
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28,866
True PTP has the smallest distance between components and the job they do, so less chance for stray capacitance or radio frequency interference. But there's less to tie components to and it's much harder to lay them out. Most manufacturers use some sort of structure because it makes it easier, in fact, I'm not aware of anyone building commercial quantities of true PTP amps now (a lot of the smaller Valco and Gibson amps were). So, most of the time saying PTP as opposed to PCB makes sense to most people.
 

dewey decibel

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10,768
People say PTP all the time when they really just mean handwired. In fact many big manufactures do in their ads as well. PTP is a buzzword now, just like 'Class A'...
 

CowTipton

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9,122
That's correct.
using a turret board is just that, turret board.

TRUE handwired point to point essentially has all components flying in the chassis.


That looks like one of Terry Gilliam's Month Python illustrations. :aok
 

teemuk

Member
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3,281
True PTP has the smallest distance between components and the job they do, so less chance for stray capacitance or radio frequency interference.
That depends entirely on how the thing is built (layout, components, etc.) but generally I'd call BS on that claim.

With ordinary PTP components tend to be rather large and there's usually quite extensive lenghts of wire or leads between them.

Compare that to well-made printed circuit board in which component leads are shortened and neccessary trace lenghts kept to as minimum as possible. You can even further improve that by using SMT components, which would be rather impossible to PTP reliably.

true PTP is the status quo in the hi-fi DIY world.
That entirely depends on what "HiFi" is being built. A simple tube amp with handful of components (usually not so hifi with a lot of supposedly euphonic THD and a low DF) or a complex solid-state amp or hybrid (usually very HiFi with great THD and DF figures)...? It's probably even impossible to build the latter in PTP fashion.
 

big mike

Cathode biased
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13,421
This amp needs to be mounted upside down in a cab with a clear plexiglass top so the guts can be viewed at all times. Awesome work.
Agreed. Bruce's work is fabulous.
They sound terrific as well. Really really good stuff.
 






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