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Old 20th November 2010, 05:18 AM   #681
qusp is offline qusp  Australia
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yeah IMO they are too big to be useful
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Old 20th November 2010, 09:48 AM   #682
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yeah the ampohm copper and polypropylene is quite nice. best medium budget combo would be a large polypropylene bypassed with small teflon. thats what i'll be doing, havent fully decided on the large cap, but bypasses will be vcap CuTF copper teflon. already have 2, just need another couple. my amp has 1mo inputZ, so I can probably forgo the large cap altoghether, but I want to maintain compatibility with variety of amps
Where did you buy the amphom copper foil & polypropylene? I think doesn't exist....I only know copper foil & poplypropylene: Amtrans AMCH Series & Reliable Capacitors PCU Capacitors.


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Old 20th November 2010, 10:06 AM   #683
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Where did you buy the amphom copper foil & polypropylene? I think doesn't exist....I only know copper foil & poplypropylene: Amtrans AMCH Series & Reliable Capacitors PCU Capacitors.


.
here and anywhere else you can buy them. Ithere are far more polypropylene caps than that around. I do like the amtrans for small value, but I like the evox rifa PFR more, I just wish they made them in larger sizes; i'm trying out the relcap polystyrene extended foil caps RTE in my portable buffalo IV/headamp for feedback LPF filter.

edit, just noticed the ampohm is copper foil paper and oil, not polypropelene. in that case relcap is the go. mistakenly thought it was polypropelene because most of their other caps are based on that dielectric.

but realy nothing is swaying me from vcap CuTF, just need to decide on what the larger polypropelene caps will be

Last edited by qusp; 20th November 2010 at 10:20 AM.
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Old 20th November 2010, 11:36 AM   #684
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Yeah that's the question, what larger polypropylene caps be? foil or metallized?

My favorites polypropylene caps are:

Metallized: Auricap (very good ratio perfomance/price)
Tin foil: Obbligatos (very good ratio perfomance/price)

About small caps to bypass I prefer teflon over polystyrenes but polystyrenes are my 2nd choice, also I like foil over metallized & copper over tin, about value I mind 10nF = 0.01uF are right 0.1uF can be oversized & will create problems. I like your choice V-Cap CuTF copper foil & teflon film but are a little expensives 54$81 each 2-4 pieces at parts-connexion V-Cap 0.01 uf / 600V CuTF Series here my 1st choice for very good ratio quality/price is Sonicap Platinum aluminium foil & teflon film better than tin foil an affordable at 24$80 each Sonicap Platinum
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Old 20th November 2010, 01:09 PM   #685
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hmm, i've never experienced any problems (subjectively) with 100nf bypass before, perhaps it has to do with most of my amps I always make sure they have very large inputZ, so really at that size they do most of the work. sometimes I will also add a 3rd cap in parallel at something like 100-1000pf for good measure. I will not rest until I have a servo on the output though no cap is a good cap IMO. as a general rule I tend to step the sizes by 1/100 so if possible I will use something like 10uf/100nf/1nf or 4.7uf/.047uf/470pf. its all jiggery pokery though

so my choices are of course the CuTF, already have 2 x 0.1uf and will get another 2
for large cap
auricap
jantzen superior
relcap

I already have some jantzen superior too, but only 4.7u and only 2, so I think my mind is pretty much made up on auricap, I wish I could find a large enough value film and foil that wasnt insanely priced, most are metalized, which is OK, but not ideal. I have had good experience with auricap and am getting some smaller ones for power supply bypassing in my rectifier and regs (my sigma22, sigma11 and salas regs), as they really are quite compact in the smaller values.

the obligato are just too physically large for me to consider and which I would love to get mundorf supreme, they are considerably more expensive than equivalent other brands. so you really pay for the name.
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Old 20th November 2010, 02:16 PM   #686
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My I/V, preamp, poweramp are all balanced Erno Borbely without any cap on the signal way, he uses servo to avoid DC.

Yes I also apply the rule 1/100 but only when you bypass films, sorry only if bypassing lytics with films is where I can't apply the rule.

Once I did a comparison test between Auricap 0.47uF/1500VDC vs Jantzen Superior Z-Cap 800VDC could you imagine which one the best?
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Old 20th November 2010, 03:22 PM   #687
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yeah I know he does, i'm thinking of getting a couple of boards made up for his IV/line amp from his articles, as I have tried to contact his new distributor about buying some kits for regs and an IV and have not recieved a reply, myself and a friend from oz were throwing in together, so apparently he doesnt want our 2000USD. contacted erno just before he stopped taking credit card orders and he forwarded it onto the new kit guy in asia and I have not received a response. so yeah I like servo, but its a little tricky for this IV

not sure on your cap battle, I havent really spent any time doing any critical listening to the jantzens, though I do suspect they were the winner, the build quality is superb.

am I warm?
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Old 20th November 2010, 09:46 PM   #688
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yeah I know he does, i'm thinking of getting a couple of boards made up for his IV/line amp from his articles, as I have tried to contact his new distributor about buying some kits for regs and an IV and have not recieved a reply, myself and a friend from oz were throwing in together, so apparently he doesnt want our 2000USD. contacted erno just before he stopped taking credit card orders and he forwarded it onto the new kit guy in asia and I have not received a response. so yeah I like servo, but its a little tricky for this IV

not sure on your cap battle, I havent really spent any time doing any critical listening to the jantzens, though I do suspect they were the winner, the build quality is superb.

am I warm?
If you want I tell Erno that you needs I/V, what due to the fact is closing November 30 only accept payment trought banking order, let me know?

About caps war the winner was Auricap 1500V over Jantzen 800V so I learn a lesson: more voltage = more dielectric & more conductive material, but always is the subjective opinion what are you looking for: Auricap more body & Jantzen more transparent so finally you can select as per your own taste. I like too the Jantzen build quality but I think the Obbligatos have more build quality, a photo just for fun

Click the image to open in full size.
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Old 20th November 2010, 10:00 PM   #689
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OPC

Boards arrived today.
Could you please indicate the proper orientation for the input protection diodes? You had mentioned a little tent instead of the layout on the board.

Also do you have any matched transistors left. I never received pricing info and my order may have been confused with the r order cancellation.

Thanks for all the great work.

Stephen
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Old 21st November 2010, 02:32 AM   #690
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I never sent anyone pricing info, because until I received the matching parameters I had only a vague idea of the time that might be involved for each match (I was pretty clear with everyone I wouldnt be giving a price till I knew what was involved). I have not received the fets yet, although I expect them to be here early this week, but until I have done a few I dont know how long each will take and I also dont know how many matched sets I will have, going by opc's results I should get about 20 pairs out of 120, so 10 sets, now at least 4 of those minimum are gone just for myself and flocchini, so they are all gone I think, but you were in my list still despite the late resistor cancellation. I may get more matches with this amount and there will be some that are not as well matched, but still as well as most other matched devices.

I have also bought about 75 dollars worth of parts and another DMM to facilitate doing this properly, including a few parts for the power supply to allow better adjustment, a few parts to build a small but transparent opamp circuit to allow adjustment of signal strength of a 1khz wav file or synth signal for signal generator and some keystone test points that will accept the bananas on my DMMs when soldered into the circuit at the right points instead of using clips. still need to find some sip sockets or something to allow trouble free swapping of the fets.

@ Merlin, receiving a reply from Erno himself has never been a problem, but this new guy I havent heard a peep out of him, Erno and I have been chatting about the purchase for a while, but it took me realizing that I may not get another chance to get me to forget about the price, hes always been very helpful but he copied the email he sent to the new guy to me, so I know he recieved it, but that was almost a month ago now. TBH now with all my other IVs i'm not sure i'll buy the IV from him, I will probably just use the files to get a double sided board made up, but I do want some supershunts.

yeah i'll be going with auricap too I think, as I said i've never compared them, but I guess my eyes allowed the build quality to fool me that they might be better given the brief listen I have had with them.
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