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 Post subject: Re: 6CY7 Stereo Amp
PostPosted: 01 Jul 2020, 19:18 
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Joined: 06 Apr 2009, 10:08
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Location: US Pacific Northwest
So today I finished the wood chassis. Here it is after the third coat of oil. I added the 4th and final coat this afternoon.
Attachment:
Oil_3rd_coat_2.jpg

This means that tomorrow I can start priming the metal for painting. Once that's done it will be time to start assembly.


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 Post subject: Re: 6CY7 Stereo Amp
PostPosted: 02 Jul 2020, 16:16 
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Well, the wood chassis is now complete with four coats of Tru-Oil all buffed out.
Attachment:
Chassis-Complete.jpg

Now for the metal finishing. Today all the painted surfaces get a coat of self etching primer.
Attachment:
Primed-Metal.jpg

Tomorrow, after the primer has had a good long time to dry and set up, comes fine sanding and the first layer of semigloss black top coat.

The physical form of this amp is coming together.


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 Post subject: Re: 6CY7 Stereo Amp
PostPosted: 02 Jul 2020, 18:49 
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Joined: 19 May 2011, 05:38
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VERY Nice!


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 Post subject: Re: 6CY7 Stereo Amp
PostPosted: 03 Jul 2020, 16:03 
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First coat of semi-gloss black is on the metal.
Attachment:
First-paint-coat.jpg

Don't worry, it looks way better in person. The wet paint reflects all kinds of things that you really can't see. This coat will have to wait at least 24hours before I touch it.


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 Post subject: Re: 6CY7 Stereo Amp
PostPosted: 04 Jul 2020, 11:33 
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Joined: 03 Jul 2020, 10:14
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Hey Matt, I have couple questions. this is my first tube amp. I have only built mostly lm3886 amps. I am a little confused on the power section. I have printed out the circuit diagrams from your website.

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?


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 Post subject: Re: 6CY7 Stereo Amp
PostPosted: 04 Jul 2020, 17:42 
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The final semi-gloss black finish is on all the exposed metal for the 6CY7 V2.
Attachment:
Final-Paint.jpg

This is a flawless semi-gloss finish after about 4 hours of dry time. After 24 hours, I'll give it a light buff and then let it cure for about a week. Next weekend I'll begin amp assembly.
:up:


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 Post subject: Re: 6CY7 Stereo Amp
PostPosted: 05 Jul 2020, 00:27 
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Joined: 23 Feb 2017, 02:02
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Very luxurious


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 Post subject: Re: 6CY7 Stereo Amp
PostPosted: 09 Jul 2020, 19:19 
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So I got a little impatient today and I thought I'd try to mount some of the components.
Attachment:
First-Assembly.jpg

Although it went ok, I did discover that I think the paint is still too soft to do major assembly and soldering. It will probably have to wait a few more days at least.

This is very annoying. :mad:


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 Post subject: Re: 6CY7 Stereo Amp
PostPosted: 11 Jul 2020, 21:23 
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Joined: 19 Apr 2020, 09:21
Posts: 2
I came across this amp build and thread a few months ago during the start of the pandemic.
I'd previously built and restored several guitar amps in the past and also built my first hifi amp, a blueglow/kegger KT88 SE amp a few years ago, but as amazing as that amp is it can be a bit too loud to really enjoy in my apartment without disturbing the neighbors. So when I came across info on this one I quickly made up a BOM and placed an order for the parts.
I dont really have any wood working skills or access to proper tools but I had ended up ordering a Hammond wooden amp enclosure in attempt to keep it somewhat close to Matt's original build. With some makeshift and crude use of step-bits,drill-bits, cheap saws and files on hand I somehow got it to all work out without botching things up or mangling the enclosure. There was a point were I was sure I would need to scrap it all and rebuild using a full aluminum enclosure but somehow it actually worked out in the end.
Upon start up I did have a strange issue with the amp. After about 20-30 mins of play I was getting a just barely audible but faint high pitch squeal/oscillation from somewhere in the amp. I couldn't track it down at first and thought maybe the 6cy7s I was using were microphonic but after swapping out 3 matched sets: Sylvianias, GEs, and RCAs, it still kept happening. Then it dawned on me that it wasn't the 6cy7s but the rectifier tube that was making all the noise. I've never come across a rectifier tube do this so it was a first for me and it was a brand new JJ so a bit of a disappointment. I swapped it with a NOS GE 6ca4 and the amp works perfectly now with no issues and I can crank it without upsetting the neighbors. A little bummed I didn't wait a little longer for the updated version Matt is working on at the moment but I'm really enjoying this amp and think it will be a great fit for my current apartment living.


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 Post subject: Re: 6CY7 Stereo Amp
PostPosted: 19 Jul 2020, 10:49 
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Joined: 06 Apr 2009, 10:08
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A very clean and nice looking build! It look's great. I'm really glad you're enjoying the design.

I must have missed your post while I was waiting the my paint to cure. :( (I took the time to do a roofing project that I'd been putting off for a couple of years.) But I think I'm going to start assembly on the V2 soon.

And for a discussion of noisy tube rectifiers, see this thread: http://diyaudioprojects.com/Forum/viewtopic.php?f=9&t=2912&start=25

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