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Old 20th August 2006, 07:17 PM   #1
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Default Pass ZV9 bits n bobs

Guys I am busy constructing my ZV9 - anyone know where to get good quality RCA sockets and speaker binding posts online?

Also can someone take me through the simplest matching procedure for the lovoltech devices.

Finally what output capacitors can anyone recommend at reasonable cost?

Thanks

WM
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Old 20th August 2006, 09:55 PM   #2
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Give these folks a look for your input/output jacks etc...
http://www.vampirewire.com/
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Old 21st August 2006, 03:45 AM   #3
Gooch is offline Gooch  United States
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I buy Cardas RCA'sfrom here Parts Connexion
I like them better then the vampire stuff I use several different ones of the vampire products. Vampire even local for me I will still buy the Cardas there even cheaper. Just my two cents

Regards,
Dave
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Old 21st August 2006, 07:02 AM   #4
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I'm no expert, but have spent a lot of time reading old posts, so all these may or may not be the best choices.

Hopefully its a useful point of reference towards the budget end of zv9 .

- My speaker binding posts are the "high end binding posts" from www.wilmslow-audio.co.uk They are a bit too big and chunky for me and obviously are a bit cheaper than the Cardas

- I decided to use stock BNCs from Digikey rather than RCAs and make up an RCA-BNC cable to plug my dac into the preamp/amp.

- On the basis of trying to extract maximum value for money from all the capacitor threads on diyaudio.com, I'm using a Panasonic TSHA 10000uF for C1 (digikey P7492) and a polyester metal film for C7 (digikey EF1106)

I got my Lovoltechs prematched, although the matching doesn't seem important for operation of the ZV9...?


Steve
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Old 21st August 2006, 08:41 AM   #5
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Default Re: Pass ZV9 bits n bobs

Quote:
Originally posted by Winding Man


Also can someone take me through the simplest matching procedure for the lovoltech devices.


Are you thinking of Vgs matching?
Or, transconductance curve matching?

I wonder whether the Vgs matching means the transconductance curve matching.
If yes, the Vgs matching will be always preferable for whatever type of amps.
If no, the Vgs matching will have no special meaning for ZV9.
Meanwhile, I do not know the method of the transconductance curve matching.

For your info, when I think the Vgs matching is deemed necessary, I usually try the Vgs matching not before building the amp, but after building it, ie in the actual operation condition . . . Itís simple and easy . . .
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Old 21st August 2006, 12:48 PM   #6
flg is offline flg  United States
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I think the procedure Nelson outlined at the end of the article can be used to match the Vgs
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Old 21st August 2006, 02:35 PM   #7
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Quote:
Originally posted by flg


I think the procedure Nelson outlined at the end of the article can be used to match the Vgs

Thanks for your letting me read it again.
As far as I understand, it is about finding sweet spot in the concave area in relation to R3 vs Vgs. Not about Vgs matching between MOSTFATs . . . Sorry for my poor understanding of Angrish . . .
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Old 21st August 2006, 05:46 PM   #8
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Vgs matching is useful to get to identical channels, which is
what I do with the F3. Knowing the Vgs of course also helps
optimize the value of the Source resistors.
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Old 21st August 2006, 05:54 PM   #9
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Hello and thanks guys....I will check out the links you have kindly posted.

I would like to match transconductance even curve matching - yes I can and will employ the method Nelson Pass refers to in the article re Vgs to determine the resistor R3 (and hence low distortion etc), but I was wondering what parts suppliers do to match the devices outside the amps i.e before they are soldered in?
BTW I only bought six of them so I guess there is only so much I can do??

I am a tube guy really and use balanced tubes wherever possible but I guess putting them in my trusty calibrated AVOMkIII will not help!!

This amp is my foray into SS and will be a comparison amp against my SET 300B, 245 and 2A3 amps thanks Nelson for bringing such an interesting SS SE amp to the masses.

The capacitors are expensive - but I guess like anything you get nothing for nothing.

I have this evening received my Conrad heatsinks - what beautiful craftsmanship - firmly recommended.

Best

WM
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Old 21st August 2006, 07:21 PM   #10
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Thanks Nelson,

Sorry my posts become out of sync as I am on "forum probation" but I replied to thread before your post.

So Vgs it will be - ta.

Best

WM
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