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Bigbottle MC only Valve/JFET phonostage Group Buy
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Old 25th November 2018, 09:22 AM   #11
Joachim Gerhard is offline Joachim Gerhard  Germany
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The input, is that a Fet-Tube cascode ?
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Old 25th November 2018, 09:26 AM   #12
Bigman80 is offline Bigman80  England
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Quote:
Originally Posted by Joachim Gerhard View Post
The input, is that a Fet-Tube cascode ?
I assume so. I will double check later, just in the supermarket lol
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Old 25th November 2018, 10:15 AM   #13
Bigman80 is offline Bigman80  England
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Originally Posted by Joachim Gerhard View Post
The input, is that a Fet-Tube cascode ?
"It is but it's special" - From Alan.
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Old 25th November 2018, 10:44 AM   #14
analog_sa is offline analog_sa  Europe
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Bigbottle MC only Valve/JFET phonostage Group Buy
No idea how hot the 5W resistors get, but even if they only dissipate 1W they appear dangerously close to the film caps.
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Old 25th November 2018, 11:27 AM   #15
Bigman80 is offline Bigman80  England
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No idea how hot the 5W resistors get, but even if they only dissipate 1W they appear dangerously close to the film caps.
There's actually more space than the picture suggests, 5mm id estimate. There is also the option of mounting them a little more centrally if you manipulate the legs a little. Also, the 5W resistor is overkill. It was not necessary to use 5w, 3W was also over spec but i went a little OTT so there isnt a concern about heat from it.

The Capacitors are rated well for the location:

Climatic category: 55/105/56 IEC 60068-1 / Operating temperature range of -55C to +105C

Temperature checks have taken place and the range was well within spec with no cause for any concern.

I will just add that this was a prototype board and as with the other little bits i wanted to change, i did ask for a little more room on the board so there should be a bit more space between components on the final board design.

One of the things i really wanted to achieve was a board with as little distance as possible between components. That is what we have done.

Last edited by Bigman80; 25th November 2018 at 11:29 AM.
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Old 25th November 2018, 12:58 PM   #16
ferret is offline ferret  South Africa
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Hi Oliver,
Definitely interested. What do you expect the price to be for the PCB?
Kevin
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Last edited by ferret; 25th November 2018 at 12:58 PM. Reason: grammar
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Old 25th November 2018, 01:08 PM   #17
Bigman80 is offline Bigman80  England
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Originally Posted by ferret View Post
Hi Oliver,
Definitely interested. What do you expect the price to be for the PCB?
Kevin
Hi Kevin,

I am hoping to get them made for approximately 30 per board. Obviously postage will be based on your location etc but that can be worked out on an individual basis.

That's us up to 4!!

As soon as I have the files, I'll get in touch.
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Old 26th November 2018, 09:35 AM   #18
pesve is offline pesve  Czech Republic
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Dimensions of PCB ?
Is it possible to slip the PCB in to Hammond box?
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Old 26th November 2018, 07:18 PM   #19
Bigman80 is offline Bigman80  England
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Originally Posted by pesve View Post
Dimensions of PCB ?
Is it possible to slip the PCB in to Hammond box?
The prototype board was 245x90mm. I expect it to be slightly wider for the finished board and maybe a bit longer but I won't know for sure untill the build files arrive.
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Old 28th November 2018, 12:08 PM   #20
Bigman80 is offline Bigman80  England
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Looks like JP is making the relevant changes so I'm hopeful of having the files soon.
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