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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 24th November 2020, 10:38 PM   #901
Robin De Wolf is offline Robin De Wolf  Netherlands
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That does look very neat and clean! Enjoy!
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Old 29th November 2020, 08:35 AM   #902
sunil is offline sunil  India
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The amp is running. Sounds super with Altecs. No noise or hum with ears stuck into the horns. Surprisingly R6 is hotter than R36. IC3, Q1/2 and IC1/2 are just fine.

Edcor CXSE25 | 310-0-310v | 7H /60R /200ma

B+ - 350v
B- - 148v
5AR4 - 5.1v

300B - 70v| 5.3v | 60ma
5842 - 178v | 6.14v

Thanks George.
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Old 29th November 2020, 11:28 PM   #903
Rinfiniti88 is offline Rinfiniti88  United States
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Hi guys, I need a little help from you,
I started building my amplifier on 45 tubes, I noticed that many people started building amplifiers on tubes 2a3 and 300v, I still want to build on 45 tubes.
There is a question about the power transformer and I am faced with a choice:
HAMMOND 6K56VG i have it
Hammond P-T270FX?
Edcor xpwr 131?
Output transformers:
One Electron UBT-2?
Electra Print BE5KB?
What transformers do you think are worthy of attention and simplicity in setting up the amplifier, if, of course, you can call this project simple, in my opinion, not everything is so simple for an ordinary guy like me.
Thanks in advance guys.
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Old 30th November 2020, 03:08 AM   #904
sunil is offline sunil  India
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Might be worth giving this a complete read. Its got the info to make a choice.

Tubes and Applications | Tubelab
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Old 7th December 2020, 08:55 PM   #905
gmonno is offline gmonno
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I didn't red your message, bought the meters and tried them.
Dumb enough to use 5V to power the meter from 5V power tranformer wires.
Clamp other two wires to R29, ON and.....luckily only 5AR4 arcing and fuse blown.
Dumb enough to try again this time using a little thing that transforms 220V AC to 5V DC , just to have an external and separated power.
JZK(R) 2 pcs HLK-PM01 AC DC 220V a 5V Paso Abajo Fuente de alimentacion Modulo Aislado Fuente de alimentacion modulo: Amazon.es: Electronica

Again same problem, another 5AR4 out.

So meters out, new rectifier, all new tests....miraculously all seem working well.

So now :

1) George I'll wait your input and make no new experiments, or use the expensive ones (Murata) like in this post :
Tubelab SEII Chassis

2) this 5AR4 gives 430V, just to remember to lower DC I should REDUCE the polypropylene microfarad correct? Now it's 10uf, shoud for example use a 5uf


Thanks

gmonno (madrid)


Quote:
Originally Posted by Tubelab_com View Post
I would not use any of those cheap little meters for measuring the bias in the TSE or TSE-II. The measuring leads in the case of the TSE operate at B+ potential. That puts nearly 400 volts on the meter leads. I doubt that any of these little meters were intended to work under this condition and are likely to die a quick and possibly dangerous death.

Unless the meter is specified to with 400 volts or more between it's input and power supply leads, I would not use it.

The only solution here is to use a floating power source that can also be elevated to 400 volts to run the meters. This can be made with a rectifier and cap on a small 6.3 volt filament transformer, but don't try this unless you know what you are doing.
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Old 10th December 2020, 07:33 AM   #906
sunil is offline sunil  India
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First DIY tube build - still bare, works fine and sounds superb. Runs between 360 and 370v ~ 67-70ma. I've built a test board for easy measurement on the right side.

Had a question, the tube test sheet shows plate V@300v and 53ma. Is that a minimum or just a result.
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Last edited by sunil; 10th December 2020 at 07:46 AM.
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Old 10th December 2020, 12:04 PM   #907
Tubelab_com is offline Tubelab_com  United States
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It is a test result used for basic testing and tube matching.

It means that when the tube is tested with 5 volts on the filament, 300 volts on the plate, and -58 volts on the grid, it drew 53 mA of plate current.

They should have minimum and maximum plate current values to determine that a tube is good before shipping.
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Old 10th December 2020, 02:26 PM   #908
sunil is offline sunil  India
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Thanks George. Besides the sheet there was nothing else in the box.

I'm hoping they will give a few years of use with 360v/70ma that my build is running at.
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Old 10th December 2020, 06:47 PM   #909
gmonno is offline gmonno
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Hi George, would you say this cap be OK to substitute the 10uf I have now near the 5AR4 to lower the voltage?

Thanks
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Old 10th December 2020, 07:33 PM   #910
gmonno is offline gmonno
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Quote:
Originally Posted by sunil View Post
First DIY tube build - still bare, works fine and sounds superb. Runs between 360 and 370v ~ 67-70ma. I've built a test board for easy measurement on the right side.

Had a question, the tube test sheet shows plate V@300v and 53ma. Is that a minimum or just a result.

Sunil very nice tubes indeed
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