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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 30th June 2019, 06:46 PM   #1
flyingmattyboy is offline flyingmattyboy  United Kingdom
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Default Matts Tubelab SSE

Soldered the board up today. It is a little crammed due to only finding 1000v k40y'S. I have installed the caps in mini binding posts so that they can be easily changed in the
future and the same with the cathode resistor.

If any one could give the picks a look over for issues I would be grateful.

I NEED to order 1 x 3 gang Phoenix screw connection as i was one short, and then the board is finished.

Thanks
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Last edited by flyingmattyboy; 14th July 2019 at 08:58 AM.
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Old 30th June 2019, 09:24 PM   #2
debije is offline debije  Netherlands
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The cathode resistors should be 5W parts, looks like yours are much less.

Rob.
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Old 30th June 2019, 09:38 PM   #3
flyingmattyboy is offline flyingmattyboy  United Kingdom
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Cheers Rob. They are Mills 5w 560 0hm wirewound. I was surprised how small they are though too when they arrived but they are definately 5w.

Thanks for pointing it out though. I have ordered 680 ohm too as l plan to use 6p3s -e too but I have ordered 7w.

Last edited by flyingmattyboy; 30th June 2019 at 10:00 PM.
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Old 30th June 2019, 11:18 PM   #4
debije is offline debije  Netherlands
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They look really small, but if they are 5W then they must be ok.
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Old 30th June 2019, 11:22 PM   #5
flyingmattyboy is offline flyingmattyboy  United Kingdom
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Yep just double checked them they are 5w.

Thanks for pointing it out though.

Matt
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Old 14th July 2019, 08:50 AM   #6
flyingmattyboy is offline flyingmattyboy  United Kingdom
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I bread boarded it all yesterday and at approx 17:00 had a can of beer that gave me the courage to turn it on. No bangs or smoke!!!!.

IT is set in simple triode mode as per Tubelabs instructions.

A lovely sounding amp and plenty of power, even in this mode for my Frugal horns with Alpair 7.3.

A few things I notice.

1) It is chuffing heavy, I am going to have to watch my back on this one.

2) On start up the ecc81 glows very bright, just for a few seconds and then dims down to normal.

3) One of my KT88 / Tungsol 6550's seems to have a hot spot in the middle at the top under the gettering. It moves with the valve though if I swap them so it's not down to my circuit. It's not red though, does this matter.

I now need an enclosure, possibilities are the large Hammond one in walnut, or possibly adapting a 2nd hand LP12 plinth. Any suggestions on this would be appreciated as I am struggling to find one that is large enough and looks nice.

Thanks

Matt
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Last edited by flyingmattyboy; 14th July 2019 at 09:03 AM.
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Old 14th July 2019, 04:32 PM   #7
w5jag is offline w5jag  United States
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1) don't know what this means;

2) normal on many European 12AT7;

3) probably just a bit of exposed heater, normal.
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Old 14th July 2019, 04:52 PM   #8
flyingmattyboy is offline flyingmattyboy  United Kingdom
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Hello

Allow me to translate.

1)...... I mean it's heavy to lift and I have herniated discs in my back.

Thanks for the reply.

Matt
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Old 15th July 2019, 02:30 PM   #9
zman01 is offline zman01  Bangladesh
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Matt,

You got some big iron there - no wonder it's heavy. Be careful!

Also be careful with the high voltages.

With transformers this size, you will need a large chassis. I think something 17" x 14" would be satisfactory - can you take a few measurements?
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Old 15th July 2019, 03:52 PM   #10
flyingmattyboy is offline flyingmattyboy  United Kingdom
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Hi. I measured up before and I think the minimum size top plate douk be 350mm x 250mm.

Thanks on the high voltages, I have earthed everything metal back to the lec. The kids and cat were not allowed In The room while I was playing it and meter testing was done via croc clips. It has been set aside now until I get to settle some more.

B+ is 445v - 448v 6.6v at heaters but that is without the valves/tubes in place so the 6.3 is about right. I have used the recommended 50k potentiometer but it seems too loud at the low positions sosomething isnt right with it. Either it is faulty or I have it wired wrongly. It is in off (zero volume) in the lowest position but at one click it is bordering on too loud, it does get even louder though as the volume is turned up though. Its had 5 to 10 hrs use over the weekend and it is bedding in nicely sound wise. I have great bass response and am not noticing an issues with high frequencies that some have reported withvtje large Hammond SE opt's. I havecto say itxall sounds nice so far.

Matt
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