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 Post subject: Can you identify...
PostPosted: Mon Feb 13, 2017 1:17 pm 
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Location: Milton, ON, CA
Which pair of tubes is the gain stage and which pair of tubes are the cathode followers? The preamp is a Consonance Cyber 222 MKII.

I’m not technical to know myself.

I understand that the gain stage has the greatest effect on sound so that is why I would like to know.

Thanks,
Audiois1st


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 Post subject: Re: Can you identify...
PostPosted: Mon Feb 13, 2017 1:27 pm 
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 Post subject: Re: Can you identify...
PostPosted: Mon Feb 13, 2017 3:35 pm 
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And dont foget the rectifier.


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 Post subject: Re: Can you identify...
PostPosted: Mon Feb 13, 2017 4:19 pm 
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europroducts wrote:
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No identifiers (eg Q1, Q2) such as one might find silk screened onto the board, as in solid state circuits? As is, the schematic is not much help to the OP.

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 Post subject: Re: Can you identify...
PostPosted: Mon Feb 13, 2017 5:12 pm 
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Looking at the schematic and the actual board, best guess would be the front two tubes near the smaller yellow caps are the gain tubes.

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 Post subject: Re: Can you identify...
PostPosted: Wed Feb 15, 2017 6:13 am 
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Thank you Dan for your best guess.

I'm just wondering if it matters that it's a SRPP design? Are all four tubes providing gain or just the two front ones?

Audiois1st
Brent

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 Post subject: Re: Can you identify...
PostPosted: Wed Feb 15, 2017 3:32 pm 
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It's actually not a srpp circuit although it is derived from that. The first stage is all your gain and is almost srpp but is actually more of a current source loaded plate follower. The second stage is just a current source loaded cathode follower.
For a more in depth explanation go here
http://www.tubecad.com/articles_2002/SR ... age11.html
This is where your preamp was ripped off from.

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 Post subject: Re: Can you identify...
PostPosted: Thu Feb 16, 2017 6:00 am 
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Thanks Dan for the confirmation. I appreciate it.

Audiois1st
Brent

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