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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 25th August 2019, 08:44 AM   #81
flyingmattyboy is offline flyingmattyboy  United Kingdom
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Yep some pics for you
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Old 25th August 2019, 02:50 PM   #82
Vunce is online now Vunce  United States
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Matts Tubelab SEE
Lookin’ really good Matt
You’ve got a lot of iron there, I hope you ate your spinach
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Old 25th August 2019, 06:31 PM   #83
zman01 is offline zman01  Bangladesh
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Coming together nicely Matt... when are you going to do the big reveal?
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Old 26th August 2019, 04:45 PM   #84
flyingmattyboy is offline flyingmattyboy  United Kingdom
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Small steps at the moment I am afraid or there could be divorce! Lol

I drilled the holes for transformers today and ordered screw washers boltsvetc for them. I also ordered some 12mm grommets for the wires under the trans. When these come I can make up the top plate and atart to wire it. I have shifted the choke up towards the righthand OPT rather than being central betweenbthe 2 OPT 's itbis now central betweenbthe kt88's and this gives me better clearance and Ithinknit looks better.

I have sat the tubes in the holes to get a flavour of how its gonna look.i.am not planning on tworectifiers bit the 12ax7 falls through the hole.

Matt
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Old 26th August 2019, 05:24 PM   #85
flyingmattyboy is offline flyingmattyboy  United Kingdom
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Pictures
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Old 26th August 2019, 06:06 PM   #86
zman01 is offline zman01  Bangladesh
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Looking good Matt!

Your hole for the 12AT7 is a bit big - however the tube sockets are PCB mounted, so it should not be a problem.

Last edited by zman01; 26th August 2019 at 06:14 PM.
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Old 26th August 2019, 07:08 PM   #87
flyingmattyboy is offline flyingmattyboy  United Kingdom
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I have use a larger b9a socket, I measured up and chose the punch best suited, there is no t a large gap around the edge. Had spinanach for tea.

Matt
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Old 29th August 2019, 04:53 PM   #88
flyingmattyboy is offline flyingmattyboy  United Kingdom
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Ok had a day off today. Managed to wire in my resistors & selector switch. I am pleased with this it works well I get these readings in ohms L is left channel R is right channel.

Position1 L 554, R 555 for kt88
Position2 L743 R745 for 6p3se,
Position3 L674 R677 for EL34

I am a little concerned about the position of the resistors and the proximity of the wires hope they don't get too hot. The resistors are 5W and the wire is high temperature stuff.

Unfortunately I drilled the hole for the switch in the top plate in the wrong place. I had to move it. I am thinking of making a plate with the valves andcresistor values to cover it. Either that or I buy a new part from hammond and start again using mine as a template.
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Last edited by flyingmattyboy; 29th August 2019 at 04:57 PM.
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Old 31st August 2019, 06:20 PM   #89
flyingmattyboy is offline flyingmattyboy  United Kingdom
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A good day today.

Any comments or feedback welcomed. Thanks

Matt
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Last edited by flyingmattyboy; 31st August 2019 at 06:23 PM.
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Old 2nd September 2019, 06:25 PM   #90
flyingmattyboy is offline flyingmattyboy  United Kingdom
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95 % built now. ������

Sounds superb and it's only going to get better as things bed in etc. The cathode resistor switching seems to be working well.

Touch wood no issues so far, pictures of It with kt88 and 6p3se's the 88's look nicer but for my taste the 6p's have the edge on sound so far.

Things left to do. 1)re wire the power input wiring with thinner cable and make it look nicer too. 2)Make a base and fit rubber feet. 3)Change nuts and bolts on traffo' s to studs with nice acorn nuts. 4)Make a plate to cover the hole I drilled in error that has the resistor values on. 5.)At a later date make a cage for the valves to be enclosed.

Incidentally I changed the switch for the inputs to a Switchcraft on fro Hifi collective and I have no cross talk now either.��

Cheers all

Matt
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