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Bigbottle MC only Valve/JFET phonostage Group Buy
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Old 17th February 2019, 09:17 AM   #171
Bigman80 is offline Bigman80  England
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Quote:
Originally Posted by Std305m View Post
Hi Oliver,
I'll post pics of my Bigbottle build when i learn how to
Steve..
Hi Steve,

You can use an image hosting site such as imgbb

It's very easy one you have figured it out.

Looking forward to the pics!
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Old 17th February 2019, 09:20 AM   #172
Bigman80 is offline Bigman80  England
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A quick announcement:

Unfortunately, the values of resistor we calculated for the RIAA accuracy are not working in the way we expected. The RIAA needs some fine tuning. This will be investigated this week and I'll make an amendment to BOM as soon as we have the level of accuracy I expect.
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Old 17th February 2019, 03:03 PM   #173
Boydk is offline Boydk  Denmark
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Good, that I wasn“t in a hurry to finish the riaa then
Looking forward to read your results.
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Old 17th February 2019, 03:26 PM   #174
Bigman80 is offline Bigman80  England
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Quote:
Originally Posted by Boydk View Post
Good, that I wasn“t in a hurry to finish the riaa then
Looking forward to read your results.
I know!!

It's only swapping a couple of resistors out but I can't get over to the test equipment. Still can't drive with my hand in plaster!

Hopefully be sorted by next week's end.
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Old 22nd February 2019, 04:02 PM   #175
Bigman80 is offline Bigman80  England
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Finally managed to get the alterations done today. Thanks to Alan for his time!

NEW & FINAL BOM!!!

Bigbottle BOM - 22.02.19.pdf

Alterations:

R113.213 = 68K

R121.221 = 180K

R122.222.= 27K

C131.231 = DO NOT FIT!
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Old 25th February 2019, 01:09 PM   #176
Bigman80 is offline Bigman80  England
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As a little experiment I doubled up the 2.2uf capacitor to 4.4uf

I think there's a bit more body to the sound available if required.
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Old 25th February 2019, 01:13 PM   #177
Bigman80 is offline Bigman80  England
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I have a few boards remaining and I'm now moving on to a new project so I'll sell the remaining stock for £20 per board

£8 delivery to UK
£15 EU
£18 USA

only 5 remain.
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Old 9th March 2019, 11:00 PM   #178
Bigman80 is offline Bigman80  England
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Down to £15 for the last few. plus postage.

There will be no more of these boards made.
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Old 18th March 2019, 07:07 PM   #179
ferret is offline ferret  South Africa
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Default 4.7uF caps

Hi Oliver,

I have slowly gone about getting the parts for this board. I managed to pick up some Panasonic PP 4.7uF 450VDC caps for C131.231 from RS Components. They fit perfectly into the space allowed. You mention that by doubling up on the 2.2uF you seemed to get better body, so I might try these out too for C132.232 & 144.

Regards,
Kevin
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Old 18th March 2019, 07:43 PM   #180
Bigman80 is offline Bigman80  England
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Kevin, I did put an update on the thread a couple of posts ago.(#175)

C131,231 are no longer required!

Use those caps in place of the two 2.2uf next to them. The third 2.2uf near the back of the PCB must be left alone as it's part of the PSU.

I'll add a pic to demonstrate.
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