RE: what is the input impedance?

Posted by madisonears (A) on July 7, 2018 at 18:35:26

In Reply to: RE: what is the input impedance? posted by airtime on July 7, 2018 at 08:05:48:

So what is probably an inexpensive pot that controls the input level takes the edge off? If that input is 100k, then you could use a 1uf film cap. I suggest Sonicap Gen 1. I've used them in my own amps and they yield a nicely 3D image, with very smooth highs.

For the fixed 10k, you should stick with the 10uf cap. Any smaller value will affect low frequencies. A 10uf film will probably not fit, so you must use an electrolytic such as an Elna Silmic, which will definitely smooth out the highs, possibly so much that you don't like it. I don't care what Nelson Pass thinks of them; I find them to be muffled and imprecise. You could try a Nichicon KZ, which is smooth yet detailed, or spend a bit for the new Audio Note Kaisei, which has been favorably compared to the famous Blackgate caps. I use BG's in a few spots, and they really are the best. They are gloriously musical and precise without a hint of brightness. The only place I know of that has genuine BG caps is Parts Connexion. They have one value: 10uf on sale for 2 bucks! Any parts on eBay are almost certainly fake. I have not heard the AN Kaisei, but I'm tempted to try it soon.

The voltage will not matter, as even the smallest cap, 16v, will be adequate. Some people claim a higher voltage of the same value sounds better, but I have never tested for that. A larger value cap, such as 22uf or more, might sound better, but not by much if at all.

Peace,
Tom E
berate is 8 and benign is 9

This post is made possible by the generous support of people like you and our sponsors:

Follow Ups Full Thread

Topic - Changing out an amp boards input cap value - airtime 08:02:16 07/06/18 (25)

Here's what I'm going to try - airtime 13:23:03 07/08/18 (0)

RE: Changing out an amp boards input cap value - fredtr 10:12:52 07/08/18 (1)

RE: Changing out an amp boards input cap value - Lew 18:51:26 07/09/18 (0)

RE: Changing out an amp boards input cap value - KanedaK 00:55:04 07/08/18 (0)

RE: Changing out an amp boards input cap value - vinnie2 05:43:59 07/07/18 (2)

I am "the good friend with a tube amp" - airtime 06:55:26 07/07/18 (1)

I feel your pain .... - TeddiJackEddie 05:53:56 07/10/18 (0)

what is the input impedance? - madisonears 19:25:30 07/06/18 (3)

RE: what is the input impedance? - airtime 08:05:48 07/07/18 (2)

RE: what is the input impedance? - madisonears 18:35:26 07/07/18 (1)

RE: what is the input impedance? - airtime 18:46:46 07/07/18 (0)

Can you change out a polar input cap for a film cap - airtime 18:26:46 07/06/18 (1)

RE: Can you change out a polar input cap for a film cap - fredtr 21:02:37 07/06/18 (0)

Is this your Marantz 250? - 1973shovel 17:50:55 07/06/18 (3)

RE: Is this your Marantz 250? - airtime 18:20:19 07/06/18 (2)

"maybe a more "mellow" brand?" - 1973shovel 09:01:26 07/07/18 (1)

RE: "maybe a more "mellow" brand?" - airtime 13:37:51 07/07/18 (0)

"I really like this amp but"... I don't - Chip647 16:18:53 07/06/18 (0)

RE: Changing out an amp boards input cap value - Blackdog 16:13:41 07/06/18 (1)

The amp is a NAD C275BEE - airtime 18:21:53 07/06/18 (0)

RE: Changing out an amp boards input cap value - bobwire 15:30:13 07/06/18 (0)

RE: Changing out an amp boards input cap value - DaveT 14:32:29 07/06/18 (1)

RE: Changing out an amp boards input cap value - airtime 18:24:59 07/06/18 (0)

RE: Changing out an amp boards input cap value - Palustris 09:46:00 07/06/18 (0)

RE: Changing out an amp boards input cap value - Hornlover 08:58:28 07/06/18 (0)

Follow Ups

RE: what is the input impedance? - madisonears 18:35:26 07/07/18 (1)

RE: what is the input impedance? - airtime 18:46:46 07/07/18 (0)

RE: what is the input impedance?

Post a Message!