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Old 23rd June 2013, 08:17 PM   #121
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Default Grant Fidelity MK2 tube buffer caps mod

Hello zcables,
I saw your post and the mod you did to your Grant Fidelity tube buffer. I also have a Grant Fidelity MK2 and thought why not mod mine. And thanks to your post and especially the photo I did just that with great results. I used Clarity SA Caps. As soon as I reconnected the buffer to my system, Sony PS1 (1001) modded using Dog Breaths mod suggestions and NAD 326BEE amp the first thing I noticed was the clarity of the sound (really, no pun intended). The buffer now has over 100 hours on the new caps and is sounding sweet.

I will repeat what you said about removing and installing the caps. No need to access the bottom of the board. Desolder the caps from the top side of the board. Cut the new cap leads just long enough to pass through to the bottom of the board.


Happy listening,
Marvin
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Last edited by pixelphoto; 23rd June 2013 at 08:19 PM. Reason: errior
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Old 24th June 2013, 03:25 AM   #122
Gost22 is offline Gost22  Bolivia
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Hi pixelphoto!
Give to see changes in the modified schematic that you've done in a positive way.
thanks!
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Old 29th September 2013, 12:30 AM   #123
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Default This is my mod

I can't really say how or if it sounds better, but it was only $38 bucks shipped and I feel happy just thinking about it
Claritycaps from Madisound
Input
2x ESA 2.2uf

Output
4x SA .47uf

I used a 40w solder iron, was too big but my 15w was too small.
I watched YouTube videos to learn how to solder.
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Old 29th September 2013, 12:41 AM   #124
AJT is offline AJT  Philippines
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Quote:
Originally Posted by Uunderhill View Post
There seems to be a lot of negativity here from some recent posts.

Yes - the schematic is dissapointing - especially, after looking at the Aikido and White Cathode followers.
However, tinkering with the Yaqin CD3 does provide inspiration to build a tube preamp.
Even a tube pre with a transformer coupled output.

The CD3 was $159 + $15 shipping.
So I'm not sure about the comment about fancy case and sold for a high price.

Clearly in some impedance situations, the Yaqin CD3 can provide impedance improvement.

Zin > 1 Meg

Zout ~ 180 ohms


Coupling caps are quite influential on the sonics.
Changing the coupling caps in the CD3 can be used to reduce resolution
and thus mask residual harshness from a digital source.
.
negativity?
yes, 100% negative feedback as a matter of fact....

impedance improvement?
well of course, tubes grids biased negative and not
allowed to draw current is indeed very high impedance,
in the megohms range so what is new?

input and output coupling caps are used here because the topology does not allow otherwise...
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Old 29th September 2013, 01:53 AM   #125
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Default Error, and I can't edit my own post?

Quote:
Originally Posted by acylonmiklos View Post
I can't really say how or if it sounds better, but it was only $38 bucks shipped and I feel happy just thinking about it
Claritycaps from Madisound
Input
2x ESA 2.2uf

Output
4x SA .47uf

I used a 40w solder iron, was too big but my 15w was too small.
I watched YouTube videos to learn how to solder.
Should say:
Input:
2x ESA .22uf
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Old 2nd October 2013, 05:30 AM   #126
Bernie7 is offline Bernie7  Singapore
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Quote:
Originally Posted by Uunderhill View Post

Please note that even though film caps are "Non Polarized", the outside
of the foil should be used as a shield - which means it should be connected
to the low Z side of the circuit.

.
Hi Uunderhill

How do I tell which end is which on my Dayton film caps?
Dayton Audio DFFC-0.47 0.47uF 400V By-Pass Capacitor - Capacitors - Crossovers & Components - Loudspeaker Components
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Old 23rd February 2014, 09:25 PM   #127
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Location: Kansas City, Kansas
Convert SD-CD3, to a 12volt external power source ?
(verses ac power.)

Wonder if it could be easily done, or not ?

Thanks
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