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Bigbottle MM/MC Hybrid Valve Phonostage PCB
Bigbottle MM/MC Hybrid Valve Phonostage PCB
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Old 4th August 2019, 11:06 AM   #1
Bigman80 is offline Bigman80  England
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Default Bigbottle MM/MC Hybrid Valve Phonostage PCB

Hi all,

After the release of the Bigbottle MC only phonostage (thread here: Bigbottle MC only Valve/JFET phonostage Group Buy - diyAudio) i was asked why there was no MM option by a few members. I didn't need MM so i hadn't considered it. Eventually i was approached by Andy who generously offered to redo the PCB design if we wanted to add in MM capabilities. Obviously i wasn't going to turn him down
Alan redesigned the phonostage to offer MM & MC.

A few months has passed and we now have a few prototype PCB's here and rather than release them untested or as a work in progress like i did last time, we thought it would be a good idea to ask for volunteers/guinea pigs who would be willing to construct the phonostage and report back if there is any unexpected results. The idea being that when it is finalised, there will be less updates and a cleaner start to finish build process.

Obviously, you will need to have the ability to troubleshoot the PCB as it is very difficult trying to help people via phone or email. This is a lesson i learned from the first board. I'll do my best to help (I am only a "middle man" after all!) and Alan will too so you dont need to be an absolute expert but a bit of knowledge will be beneficial.

So, we have 3 PCB's available. All i ask is that it's built in the near future and that you report back any findings or measurements that need looking at.

If you are interested, please drop me a PM. Please remember, this is a not-for-profit project so all help is appreciated greatly.

I'll add a few pics of the PCB later today.
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Old 4th August 2019, 12:41 PM   #2
Bigman80 is offline Bigman80  England
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Here are a few pics of the board.

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Please note, a BOM will be provided to anyone looking to help with the Beta testing.
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Old 4th August 2019, 11:33 PM   #3
Bigman80 is offline Bigman80  England
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One board taken by STD305M.

2 LEFT.
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Old 5th August 2019, 09:01 PM   #4
Jazid is offline Jazid  United Kingdom
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Yeah, go on Ollie, I'll take one. I'm obsessed with phono stages at the moment Bigbottle MM/MC Hybrid Valve Phonostage PCB
PM coming
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Old 6th August 2019, 03:50 PM   #5
Bigman80 is offline Bigman80  England
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Quote:
Originally Posted by Jazid View Post
Yeah, go on Ollie, I'll take one. I'm obsessed with phono stages at the moment Bigbottle MM/MC Hybrid Valve Phonostage PCB
PM coming
James, it will be in the post tomorrow. It all went a bit pear shaped today.

One left!
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Old 9th August 2019, 05:35 PM   #6
Jazid is offline Jazid  United Kingdom
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Good solid board. One point I have found needs addressing so far; the ECC83 valve filament (pins 4 and 5) is traced as a dead short on the board. Haven't looked further back. The PCC88 filament traces seem ok.
A question; what is the function of the switch SW1 or is it some hangover from the MC board. It limits the case that can be used or maybe I'm up a gum tree?
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Old 9th August 2019, 05:44 PM   #7
Bigman80 is offline Bigman80  England
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Quote:
Originally Posted by Jazid View Post
Good solid board. One point I have found needs addressing so far; the ECC83 valve filament (pins 4 and 5) is traced as a dead short on the board. Haven't looked further back. The PCC88 filament traces seem ok.
A question; what is the function of the switch SW1 or is it some hangover from the MC board. It limits the case that can be used or maybe I'm up a gum tree?
James,

Use my email address as DIY is doing my nut in lol

The switch is there so you can use the phonostage in MM or MC.

You only need to connect "1 & 2" and as long as a switch is wired in, you can put a case mount switch in place. So I'm told lol

O
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Old 9th August 2019, 06:19 PM   #8
Jazid is offline Jazid  United Kingdom
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Ignore my previous post - pins 4 and 5 are wired together as ECC83 has a centre tap from pin 9. For some reason I can't edit my post above.
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Old 10th August 2019, 03:09 PM   #9
Bigman80 is offline Bigman80  England
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Yep, no worries,

It's due to the different voltages that are required for the valves. As you know now anyway lol.
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Old 17th August 2019, 10:16 PM   #10
wmchugh is offline wmchugh  United States
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Is the final board still available?
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