Vishay BC128 capacitors

[sq225917]

What do you know, I have 3 in original farnell packaging, 10uf 25v, yours for postage cost.

 

[GWM]

Les puts a bead tant in that position now from what I've seen on his site.

 

[Luca]

Les puts a bead tant in that position now from what I've seen on his site.

All seem demonstrate that tantalum cap is the first alternative.

 

[Luca]

What do you know, I have 3 in original farnell packaging, 10uf 25v, yours for postage cost.

The capacitor has to be 68uf.

 

[337alant]

I have used a Mil spec wet & Solid tantalum in that position before and they were fine (not yellow, red or blue bead tantalums)
Mil spec solid tant ------https://www.ebay.co.uk/itm/Sprague-Axial-Wet-Tantalum-Capacitor-68uF-25v-135D686X0025C6-MIL-New/192657041455?epid=25023754216&hash=item2cdb41282f:g:0qUAAOSwtYRdwTPT
I would not use a solid bead tant in this position
Its a real shame that solid polymer have a high leakage rate as in every other respect they would be perfect

Alan

 

[337alant]

Les puts a bead tant in that position now from what I've seen on his site.

The pictures I see show a SAL (BC128) ?
http://avondaleaudio.com/amplifier-modules/
Alan

 

[glenn jarrett]

Hi Luca
just found some
im not planning on building another ncc amp already built 3
2x used 68uf 2x used 1k 0.1%
2 nos 100uf 30v wet tants
the wet tants and resistors are for the feedback position
tants cost me £20 each from America
but still a lot cheaper than RS..
all tested with Atlas ESR70 the results
99.44 uf 0.37r esr
100.3 uf 0.36r esr
67.08 0.08r esr
65.09uf 0.09r esr
how does £25 posted sound
20200528_115416 by glenn jarrett, on Flickr

 

[GWM]

The pictures I see show a SAL (BC128) ?
http://avondaleaudio.com/amplifier-modules/
Alan

Looking on Facebook I have seen a recent photo and it had a bead tant in there.Over the years I have seen various caps in Les builds including different values,don't think its that critical personally tried all sorts and makes very little difference.

 

[GWM]

Further to above look at the M180_300 thread on FB that looks like a bead tant to me.

 

[Luca]

Further to above look at the M180_300 thread on FB that looks like a bead tant to me.

I agree with you. The last production of NCC220, shown on FB, has a yellow bead tantalum fitted on.

 

[Luca]

I agree with you. The last production of NCC220, shown on FB, has a yellow bead tantalum fitted on.

Teddy Pardo used blue bead tantalum caps on a pair of NCC200 several years ago: https://www.pinkfishmedia.net/forum/threads/regulating-ncc200-front-end-and-other-tips.20798/

 

[Luca]

Hi Luca
just found some
im not planning on building another ncc amp already built 3
2x used 68uf 2x used 1k 0.1%
2 nos 100uf 30v wet tants
the wet tants and resistors are for the feedback position
tants cost me £20 each from America
but still a lot cheaper than RS..
all tested with Atlas ESR70 the results
99.44 uf 0.37r esr
100.3 uf 0.36r esr
67.08 0.08r esr
65.09uf 0.09r esr
how does £25 posted sound
20200528_115416 by glenn jarrett, on Flickr

Hi Glenn, thank you for the offer but ATMO I'm experiencing serious delays in international shipments. So I'm forced to postpone the building of a power amplifier to better times, perhaps after the summer. If you are not in a hurry to sell those electronic components we may resend in a few months. Where are you located?

 

[glenn jarrett]

Accrington UK

 

[ratovan2]

I bought a pack of these off that ebay seller and they all measure in the region of 86uF.
I haven`t done any voltage tests on them but was interested how much of a problem the difference in uF value would make to the circuit.
I also wondered about alternative Tant cap sizes/types, having considered a 68uF 6.3v here:- https://www.mouser.co.uk/ProductDetail/581-TAP686K006GSB is this a viable alternative.
Has anyone got details of a replacement part they have used in this C11 position or is it not massively critical.
Thanks.

 

[Fatmarley]

I think BC128 make great coupling caps in Naim preamps, but they are very revealing. They will most likely sound bad with standard Naim (harsh or bright) but great when the power supply / earthing etc is sorted.

 

[GWM]

I bought a pack of these off that ebay seller and they all measure in the region of 86uF.
I haven`t done any voltage tests on them but was interested how much of a problem the difference in uF value would make to the circuit.
I also wondered about alternative Tant cap sizes/types, having considered a 68uF 6.3v here:- https://www.mouser.co.uk/ProductDetail/581-TAP686K006GSB is this a viable alternative.
Has anyone got details of a replacement part they have used in this C11 position or is it not massively critical.
Thanks.

It's not critical I have 33uF axial tants in there Naim used 47uF beads I think,Les uses beads now check of the latest post in the Qudos thread.