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Bigbottle MM/MC Hybrid Valve Phonostage PCB
Bigbottle MM/MC Hybrid Valve Phonostage PCB
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Old 21st May 2020, 11:56 AM   #611
coolfox007 is offline coolfox007  United Kingdom
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Default New pcb

Quote:
Originally Posted by Bigman80 View Post
Haha!

DHL have delivered some brand new PCBs..

I will start packing them over the weekend and they will be on the way next week.Attachment 838991
Hi Oliver
Can I buy couple of this ?
What is the logistics?
Im located in UK 🇬🇧
Thanks
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Old 21st May 2020, 11:58 AM   #612
Bigman80 is offline Bigman80  England
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Quote:
Originally Posted by coolfox007 View Post
Hi Oliver
Can I buy couple of this ?
What is the logistics?
Im located in UK Bigbottle MM/MC Hybrid Valve Phonostage PCB
Thanks
Sure! I'll drop you a PM
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Old 22nd May 2020, 06:25 PM   #613
acccruz is offline acccruz  Portugal
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Ive got my board.

Arrived in perfect shape and looks so beautiful.

Thank you very much!
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Old 22nd May 2020, 09:24 PM   #614
Bigman80 is offline Bigman80  England
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Quote:
Originally Posted by acccruz View Post
Ive got my board.

Arrived in perfect shape and looks so beautiful.

Thank you very much!
Thanks for letting me know!

Enjoy the build
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Old 26th May 2020, 08:37 AM   #615
Bigman80 is offline Bigman80  England
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Over the last week or so, we have been having a play with the new Bigbottle Multifet boards.

The idea being that the pairing up of Jfets would offer a reduction in noise.

The first set of boards yielded a frustrating result. We could not get enough gain from them when using the BF861C fet. In fact, there was very little gain.

We then tried some discontinued BF862 that we had in stock, and this has provided the results we originally expected.

The noise floor is now lower by 3db, gain is a bit higher, which is good.

I have ordered 40 BF861B Jfets to try next, as we really want to use legitimately sourced Jfets, not only for their production quality but for reliability.

I have had multiple Chinese bought BF862 fail for no apparent reason, and that's a very little device to have to keep removing and replacing.

So, the next step this week will be to build 2 more Multifet boards and get them measured by Alan. IF all is well, I'll look at a group buy for them.

With the resistors being 0603 size, I am thinking the best way forward is to assmble them prior to delivery. But we'll cross that bridge when we come to it.



Attachment 84757020200522_100639.jpg20200522_111817.jpg
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Old 26th May 2020, 12:07 PM   #616
Flikoman is offline Flikoman  Croatia
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Quote:
Originally Posted by Bigman80 View Post
Over the last week or so, we have been having a play with the new Bigbottle Multifet boards.

The idea being that the pairing up of Jfets would offer a reduction in noise.

The first set of boards yielded a frustrating result. We could not get enough gain from them when using the BF861C fet. In fact, there was very little gain.

We then tried some discontinued BF862 that we had in stock, and this has provided the results we originally expected.

The noise floor is now lower by 3db, gain is a bit higher, which is good.

I have ordered 40 BF861B Jfets to try next, as we really want to use legitimately sourced Jfets, not only for their production quality but for reliability.

I have had multiple Chinese bought BF862 fail for no apparent reason, and that's a very little device to have to keep removing and replacing.

So, the next step this week will be to build 2 more Multifet boards and get them measured by Alan. IF all is well, I'll look at a group buy for them.

With the resistors being 0603 size, I am thinking the best way forward is to assmble them prior to delivery. But we'll cross that bridge when we come to it.



Attachment 847570Attachment 847571Attachment 847572
So, what's next? MC users who bought this board can't use it or?
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Old 26th May 2020, 12:08 PM   #617
Bigman80 is offline Bigman80  England
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Quote:
Originally Posted by Flikoman View Post
So, what's next? MC users who bought this board can't use it or?
I dont understand?
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Old 26th May 2020, 12:13 PM   #618
Flikoman is offline Flikoman  Croatia
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Quote:
Originally Posted by Bigman80 View Post
I dont understand?
You said that BF861C doesn't work here, as I understod, or?

Regards
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Old 26th May 2020, 12:13 PM   #619
Bigman80 is offline Bigman80  England
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Quote:
Originally Posted by Flikoman View Post
You said that BF861C doesn't work here, as I understod, or?



Regards
Doesnt work on the Multifet board.

Theybare fine for the original PCB usingb1 per channel
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Old 26th May 2020, 12:15 PM   #620
Flikoman is offline Flikoman  Croatia
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Quote:
Originally Posted by Bigman80 View Post
Doesnt work on the Multifet board.

Theybare fine for the original PCB usingb1 per channel
Ok, my fault. :-)

I'll try to read this thred more.

Regards
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