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Old 20th August 2013, 12:43 PM   #1061
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*Bump* just for the record:

0.1uF/100V/15mm Wima FKP3 (film/foil) is audibly superb at C4 - much better than MKP10 or MKP2 of the same value. The only problem is the size - it will probably fit with some bending of leads in a TP v1.2 and my v1.3 Rev C boards. No bending of leads required on a v1.4 board - it's a drop-in replacement.

Audible improvement - micro-detail, air, resolution, reduced glare (e.g. trumpets, cymbals) in the mids, better voice and instrument separation.
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Old 24th August 2013, 08:26 AM   #1062
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i have mundorf supreme there much bending and extension required :P
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Old 24th August 2013, 04:33 PM   #1063
suburra is offline suburra  Italy
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Quote:
Originally Posted by PreSapian View Post
i have mundorf supreme there much bending and extension required :P

Sell ​​it, and paid your debits
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Old 24th August 2013, 07:01 PM   #1064
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I have something better. Please give me till next week to test out the board
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Old 18th February 2014, 11:14 PM   #1065
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Default Alternate transistor?

I just obtained a MyRef RevC board and am sourcing parts from mouser and digikey in the US.

The schematic included with my board and several BoM here call for BC546 or BC546CTA specifically for Q2 and Q3. I cannot find this in stock at mouser or digikey. Can someone point me toward a suitable in stock replacement?
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Old 19th February 2014, 06:16 AM   #1066
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Quote:
Originally Posted by MichaelPF View Post
The schematic included with my board and several BoM here call for BC546 or BC546CTA specifically for Q2 and Q3. I cannot find this in stock at mouser or digikey. Can someone point me toward a suitable in stock replacement?
Any BC546 hFE grade should work - I've used BC546B there for ages without problems. In a pinch, BC547A or B should also work. It has sufficient Vceo (45 V, IIRC) for that application - the protection relay rail doesn't exceed +24..28V maximum.
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Old 19th February 2014, 06:41 AM   #1067
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Quote:
Originally Posted by MichaelPF View Post
I just obtained a MyRef RevC board and am sourcing parts from mouser and digikey in the US.

The schematic included with my board and several BoM here call for BC546 or BC546CTA specifically for Q2 and Q3. I cannot find this in stock at mouser or digikey. Can someone point me toward a suitable in stock replacement?
Mouser has plenty of these BC546B in stock - 512-BC546BTF
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Old 20th February 2014, 10:26 PM   #1068
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Thanks for the pointers. The amount of parameters specified for a given transistor left me wondering what mattered and what did not. It is all a bit over my head.

Good to know what will just work. Thank you.
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Old 9th March 2014, 07:43 PM   #1069
Kreisky is offline Kreisky  Italy
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Hello,

I've tried 1uf K75-10 bypassed by a 820pf Teflon FT-1 on my tweeter crossover... the original cap on crossover is an inexpensive MCap by Mundorf.
It was quite difficult to hear the differences between the two caps, maybe it depends from the crossover design: a parallel RC (9ohm-1uf) in series with the high-pass capacitor (4,7uf) and I changed only the 1uf cap But, in the end I preferred the MCap because it is more sweet with the same detail.

I don't now if trying the K75-10 in C13 (now I have Evox Rifa), should I expect a more audible change ? Is it even worth trying ?

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Old 13th March 2014, 08:03 AM   #1070
Naaling is offline Naaling  Thailand
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Hi

This is my first post although I have been lurking here for many months. In fact Ive read so much about the My_Ref amp that I think of Dario, Siva and Tom as friends even though they dont know me - maybe Siva does a bit since I bought a couple of boards from him.


Its now time to start assembling the amp so Im hoping to get some last minute advice. I realise that Im late to the party, but its never too late to build a good amp!


I will be ordering the BOM through Mousers Thailand website. All other websites I can find either do not provide information in English or charge way too much for shipping to Thailand. Local dealers stock very little in the way of quality components and when they do Im very wary of fakes. What I am trying to do is build the best amp I can using standard industrial components, and I would be particularly interested in the latest thinking in a few areas. Please note I will be building a RevC not RevFE


1. Compensation & C10/C34 I intend to use standard RevC compensation. Does anyone have a better idea? I will be using CDE silver micas.
2. Electrolytic capacitors What should I use in a post Black Gate world? I am intending to use Nichicon KZs for C1,C2 &C9 and FGs for C6 & C11. Mouser stocks Panasonics, Nichicons and some lower voltage Elna Silmic 11s. but no Cerafines.
3. C13 I am leaning towards Russian K73-16s. They are cheap and one of the few components that can be bought reliably off ebay.
4. R13 Is the Caddock MK132V really worth the extra cost over a standard KOA CFR?
Any other advice would be very gratefully received


Regards
Fred
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