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 Post subject: Re: 6EM7 power amp
PostPosted: 21 Sep 2013, 09:03 
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Location: Australia
Geek wrote:
Those are later Shuguang.

Yours looks late 80's to early 90's.

We are going to get bumped of this thread.

Geek: is that a good thing.?

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 Post subject: Re: 6EM7 power amp
PostPosted: 06 Oct 2013, 21:53 
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Funny story: I had been contemplating building Suncalc's 6V6 on an Acacia chopping brd. Like Arabella's. I also had to get my mother a new chopping brd old people just can't part with old stuff. Mum's chopping brd has to be over twenty years old and not in good nick.

So I go back to the store which sells the Acacia chopping brds to get one for my next project and cheaper, lighter brd for mum. The guy remembers because I told him then what I was going to do with it. He tells me and then said he sold the last one a few days back. I had been thinking about visiting the store for a weeks now. And when he took over the shop the previous owner had accidentally ordered a pallet load, hundreds of them, which has taken the current store owner, three years to sell off.

Now that's funny. But stop laughing because they are no longer available and therefore no more to be found. Oh well I'll just have to do it all another way. Maybe a more conventional build.

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 Post subject: Re: 6EM7 power amp
PostPosted: 07 Oct 2013, 06:09 
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Ooop, missed this post :blush:

mwhouston wrote:
Geek wrote:
Those are later Shuguang.

Yours looks late 80's to early 90's.

We are going to get bumped of this thread.

Geek: is that a good thing.?


Maybe. They were hit-or-miss back then.

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 Post subject: Re: 6EM7 power amp
PostPosted: 12 Oct 2013, 19:08 
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I had stated that I was finished with the 6EM7. I haven't yet sold off the last two pairs of my NOS tubes and just recently bought another cool looking chopping brd. Another 6EM7 may be in the wind. What I particularly do like about this amp is you only need two tubes for a power amp particularly if you chose SS rectification. The other thing I like is its great sound.

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 Post subject: Re: 6EM7 power amp
PostPosted: 12 Oct 2013, 20:15 
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mwhouston wrote:
Well I have sad news. Like an old lover, it's time to let go and move on.
mwhouston wrote:
I had stated that I was finished with the 6EM7. I haven't yet sold off the last two pairs of my NOS tubes and just recently bought another cool looking chopping brd. Another 6EM7 may be in the wind.
I just knew that you had at least one more in you. :up: Can't wait to see it.

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 Post subject: Re: 6EM7 power amp
PostPosted: 12 Oct 2013, 21:32 
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Suncalc wrote:
mwhouston wrote:
Well I have sad news. Like an old lover, it's time to let go and move on.
mwhouston wrote:
I had stated that I was finished with the 6EM7. I haven't yet sold off the last two pairs of my NOS tubes and just recently bought another cool looking chopping brd. Another 6EM7 may be in the wind.
I just knew that you had at least one more in you. :up: Can't wait to see it.

The acid test for wooden top plate is "can a drill a 1" hole in it without splintering". In the next few days I will give this a try. After building one amp on a heavy wooden top plate I'm aware of the tricks and traps involved. It has to easier second time round. Also this build relies on the fact that the guy who bought Arabella is happy for me to keep one pair of tubes. I did promise him two pairs.

What about a 6EM7 amp without power tranni and SS rectification? Our mains Voltage is 240V. Not had to develop 300V plus. Also I have some heavy duty Chinese OPTs which will suit.

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 Post subject: Re: 6EM7 power amp
PostPosted: 16 Oct 2013, 22:18 
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OK you have seen it all before. Pretty ordinary build. I have some large 15W (5K\8ohm) Chinese open frame OPTs which will reside attached to the inside of the wooden base on rubber grommets for isolation. Also a small power filter will sit under the power tranni under the top plate. Rec tube - 5Y3 sovtek.Top plate colour? Don't all cringe, this time simple black!

Nice Sylvania NOS 6EM7s on ceramic sockets, 20H 100mA Hammond choke and 144mA power Tranni. A bit of gold bling at the back for the speakers, small power switch and fuse. Time to mark it all out for an appointment with the drill press.

OMG I nearly for to disclose the name. Now its time to cringe: "Abstinence" to remind me that four of the one type of amp is enough. Abstain. Time to move on.

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 Post subject: Re: 6EM7 power amp
PostPosted: 17 Oct 2013, 07:11 
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Joined: 05 Jun 2012, 13:10
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Location: Darboy, WI, USA
What are the rough dimensions of the metal plate?

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 Post subject: Re: 6EM7 power amp
PostPosted: 17 Oct 2013, 17:28 
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RossD wrote:
What are the rough dimensions of the metal plate?

30 X 22cm.

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 Post subject: Re: 6EM7 power amp
PostPosted: 19 Oct 2013, 07:45 
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I would like to build a headphone amp using this tec. tube : http://www.emissionlabs.com/datasheets/EML5U4G.htm

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