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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 21st March 2020, 10:54 AM   #1
gmonno is offline gmonno
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Default TSE must die .... not yet

Hi folks, I'm Giuseppe writing from Madrid.
Yes, struggling with Covid-19 and locked up at home.
I have a TSE and happy with it from....maybe 7-8 years.
Maybe the virus, maybe don't know what, the thing is that a couple of days ago I was listening music from my loved TSE 300B when a channel said : puuf and stopped music. After that R14 begun to smoke....
To make a long story short, after some measurement I thought that Q1 was bad and replaced it (probably after so long a screw released and Q1 lost connection wirh heatsink.
Made all the checkout following instructions, put on 300B, speakers on......no music from one channel and very strange measurement....I was measuring R19 - R29 and the value from "bad" channel was out of measure (one channel : 65mV , the other : 6V) ..... stop all, off the tubes, check again.

Attached is a photo with measurement I have today....I think all is OK so muy next guess is that one of 300B is bad.

What do you think?
Is there a way I may check a bad 300B or next steps?

Many thanks, and thanks George for TSE-II.

Best regars all

g.
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File Type: jpg TSE-measure.jpg (377.6 KB, 192 views)
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Last edited by gmonno; 21st March 2020 at 11:04 AM.
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Old 21st March 2020, 08:15 PM   #2
gmonno is offline gmonno
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Auto answer : I tried to put the "good" 300B in each channel and ... measures good, and sound OK.

The "bad" 300B measures too high voltage on R18 (6-8V vs the normal 0.65-0.70 V)

So now the new question is : what kind of 300B do you have and are you happy with?

Many thanks for reading.

g.
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Old 23rd March 2020, 12:33 PM   #3
colnago55 is offline colnago55  United States
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Hi Guiseppe,

I'm enjoying my JJ's. So far, they have been very reliable.

House bound in NYC, Jacques
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Old 23rd March 2020, 01:38 PM   #4
Kay Pirinha is offline Kay Pirinha  Germany
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Hi Giuseppe,
due to some uncertain instances one of your 300's has become gassy. Sorry, I can't help with recommendations, 'cause I don't have any experience with DHT's, but those J/J's sound reasonable.
Good wishes for your recovery!
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Old 23rd March 2020, 10:33 PM   #5
amandarae is offline amandarae  United States
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Click the image to open in full size.

JJ 300B at 174,5 volts bias. Sounds great!
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Old 25th March 2020, 12:38 PM   #6
gmonno is offline gmonno
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Thanks for your answers and good feeling about JJ.
Meantime I've been decided to go and try EMS (Emission Labs) 300b, are a little expensive but have 5 years warranty and nice reviews

Will let you know, best regards

g.
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