Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: EL34 on August 24, 2014, 04:52:47 pm
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How do you like the first black Hoffman Turret board?
I now stock black on this page
http://hoffmanamps.com/MyStore/catalog/parts12.htm (http://hoffmanamps.com/MyStore/catalog/parts12.htm)
It is non conductive G10 for those that are afraid of it :icon_biggrin:
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Been some issues with black boards being conductive. Might want to check.
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It takes decades of humidity for black fiberboards to become conductive. It should take many more decades for a black glass/epoxy board to become conductive (if it ever happens).
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My understanding is Doug has already checked out the "conductivity issue" on the black board and there is reportedly no concern with these boards.
I think the black boards look really great! Populated they'd look even better. The black contrast with caps, resistors, etc... should look pretty cool!
With respect, Tubenit
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I like the look and will be ordering some soon.
As a side note, years ago I bought the metal tool with the holes in it from your store that I use all the time to space my layouts. I routinely use 1/8" eyelets in addition to the turrets and haven't had any trouble with the spacing. I think I read recently that you only recommend that spacing for the turrets. Am I correct in that? Glad I bought one before you quit selling them. Very good tool to have for amp building.
Thanks
Mike
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apparently some of the G10/FR4 is treated to be anti-static and therefore semi-conductive, however, not all black G10/FR4 is anti-static treated.
--pete
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Cool Board :thumbsup:
K
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I like the look and will be ordering some soon.
As a side note, years ago I bought the metal tool with the holes in it from your store that I use all the time to space my layouts. I routinely use 1/8" eyelets in addition to the turrets and haven't had any trouble with the spacing. I think I read recently that you only recommend that spacing for the turrets. Am I correct in that? Glad I bought one before you quit selling them. Very good tool to have for amp building.
Thanks
Mike
I think you are talking about the 1/4 inch thick aluminum drilling template.
Nothing has changed, I still use that same spacing on my CNC machine
As long as the eyelet rims are not too close to each other, it should work just fine for eyelet spacing
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apparently some of the G10/FR4 is treated to be anti-static and therefore semi-conductive, however, not all black G10/FR4 is anti-static treated.
--pete
This board is not conductive
Fender type fiber board is way more conductive than this G10
When I get time, I'll take a scrap of the black board and hook it up to 400+ VDC and see if I can get a reading to another lug next door
I get zero reading with the test leads 2mm apart using a meter checking for resistance
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I'm the guy that started the conductive black board scare of 2013.
When I first started doing amps I bought 6 of these boards (pictured) from AES because I liked the "universal" punched board idea, and I liked the look of the black board.
Luckily, I found the conductive board on my first build and sent the other 5 boards back. It pissed me off as much as anything I have ever experienced because of the amount of time that I had spent trying to achieve a super clean board look, with nicely bent components and all of that rigmarole.
When I completed the amp I found that I had DC on one of my pots,,,and after a short diagnosis (and coupling cap replacement), I disconnected everything form the suspect turret and I almost broke my hand on my workbench when I measured 100VDC from a turret to ground with the turret touching nothing but the board. I am 1000% sure of what I experienced and even brought over one of our repair techs to confirm I hadn't lost all of my marbles.
I kept a piece of the board material to compare it to black G-10, and it is not the same material. The stuff from AES just feels cheaper, and does not have the high quality appearance of true Garolite.
Since that time I have bought a sheet of G-11, and I've been using black G-10 from one of Doug's competitors. :embarrassed:
I am thrilled to see Doug now carrying the black G-10, and will be ordering my next piece from him in the very near future.
:wav:
This is the crap board that I had to warn my fellow forum members against using:
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Excellent report
I think the black board I did today looks great
It goes with both my black fully carbon bikes
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The boards that I was thinking about did come from CE. I am sure Doug's are fine. Take a look at this video--This was a CE board.
https://www.youtube.com/watch?v=p-c3nTyobds&feature=youtu.be (https://www.youtube.com/watch?v=p-c3nTyobds&feature=youtu.be)
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Good video
I am not sure why CE is selling these boards?
Do they still sell them?
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The guy that posted that said he contacted them and returned the boards he had. They replaced them and took the black ones that they had out of stock.
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I am not sure why CE is selling these boards?
Do they still sell them?
Yes, they do. They claim it is glass/epoxy, so no idea if it is still the same stuff SG had a problem with. Regardless, seems not all boards are made equal. :icon_biggrin:
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Good video
I am not sure why CE is selling these boards?
Do they still sell them?
perhaps someone mistakenly spec'd the anti-static treated material.
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Hoffman 5F6A Black Bassman
I don't know if I can ever go back to plain old Natural after seeing the black with lugs installed
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That looks really sharp!
With respect, Tubenit
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Thanks Jeff