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It is currently 13 Aug 2020, 20:16

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 Post subject: Re: 6CY7 Stereo Amp
PostPosted: 23 Jul 2020, 18:51 
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Joined: 06 Apr 2009, 10:08
Posts: 1678
Location: US Pacific Northwest
I did some basic assembly on the new 6CY7 top plate today. For such a small plate (6-1/4" x 10-1/2") it's kind of heavy. I made it out of 0.10" thick aluminum because I wanted to protect against sag.
Attachment:
Top-Assembly-1.jpg

The top hides a lot going on underneath.
Attachment:
Top-Assembly-2.jpg
It look's so messy mostly because of all the transformer and choke leads that have not been soldered into place yet. It should be pretty neat and tidy when everything get done.

Before I start wiring this up I think I'm going to get some "pre-wiring" done on the chassis.

Definitely making progress.


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 Post subject: Re: 6CY7 Stereo Amp
PostPosted: 24 Jul 2020, 08:46 
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Joined: 19 Apr 2020, 09:21
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Suncalc wrote:
And for a discussion of noisy tube rectifiers, see this thread: http://diyaudioprojects.com/Forum/viewtopic.php?f=9&t=2912&start=25

Interesting read. Appears I was having the opposite situation occur as the rectifier I was using started introducing noise after 20-30 mins of warming up.
Your build is looking great so far. Really interested to hear your thoughts comparing two versions once you've finish it.


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 Post subject: Re: 6CY7 Stereo Amp
PostPosted: 30 Jul 2020, 01:01 
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Joined: 30 Jul 2020, 00:40
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Hey I just want to thank you, just finished my 6CY7 build, flipped the switch...it works! And what sound, after about 1 hour the caps really warmed up and it both opened up & got a bit louder!

I deviated a bit from the schematic as I used a SMPS & boost converter instead of linear. Omitted the first choke, mine has CRC with a 68 ohm resistor, and then went with the recommended CLC Hammond 154Ms individual filtered channels. Absolutely quiet.

Does a triode-strapped 6BQ5 sound this good? Maybe I'll build one and see.
I'm finding it hard to turn this off and go to sleep. Thanks again!


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 Post subject: Re: 6CY7 Stereo Amp
PostPosted: 30 Jul 2020, 19:59 
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Joined: 30 Jul 2020, 00:40
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ronel wrote:
my questions is after the heater section and then the 2 100ohm .5w resistors to ground is that classy ground or is that connected to the negative side of the capacitors on the 6ca4 section?

Yes, connected to all the - of the filter caps, and I believe that's called a "virtual ground" because some power transformers do not have a center tap for the filament winding.


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 Post subject: Re: 6CY7 Stereo Amp
PostPosted: 02 Aug 2020, 13:30 
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Joined: 06 Apr 2009, 10:08
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Finally have gotten around to some assembly on the new design. This should give a little indication of what she'll look like.
Attachment:
Partial-Assembly.jpg

And some chassis internals.
Attachment:
Partial-chassis-wiring.jpg

I don't know how much more I'll get done today, but I am making progress (albeit slowly).


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 Post subject: Re: 6CY7 Stereo Amp
PostPosted: 02 Aug 2020, 17:32 
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A little progress on the main board; mostly just wiring.
Attachment:
Some-Progress.jpg


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