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Old 18th December 2004, 06:54 PM   #1
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Default Mro Pt8

I'm looking for the datasheet but I've found nothing.
The equivalent tube is the TS8...no data even for this one
Where can I find the data?

Thankyou in advance

Mark
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Old 19th December 2004, 03:22 AM   #2
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Hello,

Looking to build a Katelelo?

You may need to ask someone for a copy of the datasheet from the " Electronic Universal Vademecum ".

I'm not sure about this but I think most of these PT references were meant for postal services/governmental services.

Ciao,
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Old 19th December 2004, 06:05 AM   #3
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Hi Mark,

Vade-Mecum gives the following data for the TS8:

heater V 4
heater I 0.25 A
anode V 130
grid V -8
anode I 8 mA
transconductance 1.3 mA/V
plate R 5.5K
amplification factor 7 V/V
load resistance 6K

That's it!
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Old 19th December 2004, 12:27 PM   #4
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Katelolo

Nice design using a PT8 with some info about operating points. Might do for some 'reverse engineering' if you can't find curves etc.
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Old 19th December 2004, 03:46 PM   #5
jlsem is offline jlsem  United States
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Quote:
You may need to ask someone for a copy of the datasheet from the " Electronic Universal Vademecum ".
http://www.mif.pg.gda.pl/homepages/f...ademecum0.html

It appears to be the equivalent of the STC 3A/141A, for which there are plate curves.

I have plans to use it as a line out with transformer for my Loesch pre-amp.

John
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Old 19th December 2004, 04:42 PM   #6
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Hi guys...thankyou

No, I don't want to build a Katelelo. I'm playing with constant current source as you can see here:

5687 and ccs?

I like what I've listened...and I like even more the fact that I'll be able to try different tubes with the same ccs, same power supply and only a few changes on the circuit. I've made different boards for HT power supply, heater supply ( 2 boards, one for the rectifiers and rcrc filter and another one as heater constant current source ), ccs load and line stage circuit, so I can change only the circuit board, set the ccs reference resistor and the heater supply ( 2 resistor) and try different tubes. When I'll make different audio board I'll be able to change easily the pre...and listen to the differences . I have no long experience in audio DIY and I've not electronical background ( I started to DO something last year) so I think this will be an interesting investigation . I want to learn as much as possible, I'm bewitch from diy world. I love music and I really love to understand how things works ( well this is the reason why I've chose to study meccanical engineering). I think finding this forum I've found a gold mine...ritch of golden guys. Most of you are far away from my country...but here I feel like home

However...why PT8? I'll test some diffenret tubes...why not a single triode DHT? A frind of mine, listened the 5687 I've built, ask me to try with PT8 and ec8010, he'll lend me these tubes. I'll try with 6sn7 ( single and pse), 6922 amd 6350 too...this tubes are in my drawer The only data I didn't found is the pt8 one.
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Old 19th December 2004, 06:10 PM   #7
rdf is offline rdf  Canada
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Quote:
Originally posted by jlsem


http://www.mif.pg.gda.pl/homepages/f...ademecum0.html
Wow, thanks for posting that great resource!
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Old 19th December 2004, 07:39 PM   #8
Giaime is offline Giaime  Italy
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Quote:
"I think finding this forum I've found a gold mine...ritch of golden guys. Most of you are far away from my country...but here I feel like home. "

Non proprio. Mezz'oretta di macchina e ci possiamo incontrare. Io sono di Mestre!

...ahahah I won't translate that....
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Old 19th December 2004, 08:26 PM   #9
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Quote:
Originally posted by Giaime
Quote:
"I think finding this forum I've found a gold mine...ritch of golden guys. Most of you are far away from my country...but here I feel like home. "

Non proprio. Mezz'oretta di macchina e ci possiamo incontrare. Io sono di Mestre!

...ahahah I won't translate that....

Figata...Muhahahaha
I think you have to drive for one hour...I'm in Padova 4/5 days a week for university lessons, but my system is in Feltre (Bl)
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Old 20th December 2004, 03:18 PM   #10
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Quote:
Originally posted by jlsem


http://www.mif.pg.gda.pl/homepages/f...ademecum0.html

It appears to be the equivalent of the STC 3A/141A, for which there are plate curves.

I have plans to use it as a line out with transformer for my Loesch pre-amp.

John

Thankyou jlsem...the 3A/141A curves look good, they seems very linear. For the TS8 there is poor documentation...in Italy this tube was used for telephonic amplification. I can test it because one of my friends have two pt8 and he ask me to try this solution. I'm looking on the net to buy two pt8 but I don't know where can I find it. Other solutions for dht tubes? 26?

Mark
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