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Old 26th June 2006, 04:13 AM   #1111
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Default Fantastic Work

Quote:
Originally posted by ALEKSANDR
P.S.: When it's about tubes, you do not ask to much questions (as someone said before in this thread, "tubes passionates are friendlier").

ALEKS
That is an amazing statement! Only wonderful people can say things like that. It makes me happy to hang out here knowing that people think like this.

The Sony's look nice(I Googled them). You have done very well salvaging parts from other equipment. I love to recycle good parts but I think you have done just as good if not better than many people who use new components. I would have a hard time believing you but there it is...pictures=thousands of words!

Amazing work for recovered gear!

Shawn.
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Old 26th June 2006, 08:02 AM   #1112
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Hello Shawn,

Thank you for your words. In Romania, there are few people thinking like this. The vast majority think like: "it doesn't matter how it looks, it sound great" or "salvaged parts, new parts, the same but salvaged parts are cheaper or free".

During my life, I've met various people with various mentalities (I've been in other countries too and saw how people think there). I never limited myself to a single type of thinking / mentality and I think that helping other people is just about as great as helping yourself.

Sorry for the off-topic, but as I can see, tube-peoples tend to fill out this forum.

Now, my degree is not in old equippment (such as tubes), but automation and stuff. Tubes are my passion, I can remember when I was young I stood hours watching tubes glow... I tried to rescue old parts and give them another life in new technology mixed with old technology. Parts such as transformers (ugly thing by default) when cleaned and covered with some Aluminium tend to look great as in my ARITMA amplifier. And so on.

As for my site, I wanted to create a small community of electronists (or not) and to present their projects (anyone who wants to contribute with photos and text -- English and Romanian -- is welcomed), till now, only my projects are there, and it's a shame because we have great engineers who do great jobs but manifest some weird mentality and not every project they made looks as great to post on an Internet site, although the're experienced man and make great stuff.

Hope I did not bored anyone with this text and excuse-me for my English.

Regards,
ALEKS
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Old 26th June 2006, 12:15 PM   #1113
gianis is offline gianis  Greece
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Default 958 tube

My latest preamplifier using the 958 acorn tube
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Old 26th June 2006, 12:18 PM   #1114
gianis is offline gianis  Greece
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Default acorn

under listening test..
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Old 26th June 2006, 01:53 PM   #1115
rdf is offline rdf  Canada
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Hi Gianis. Whoa whoa whoa, the 985! Currently the 9002, the 7-pin sub for the 955, inhabits the front end of my EL84 amp. How do you like the 958? How are the filaments powered? Any troubles with RF oscillation?
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Old 26th June 2006, 02:04 PM   #1116
SY is offline SY  United States
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Aleksandr, very nice site. The Romanian isn't too difficult to puzzle out.
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Old 26th June 2006, 02:11 PM   #1117
Giaime is offline Giaime  Italy
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Ah, Aleksandr, I spotted an error on your site.

In the "Vanzari | Tuburi" page, you list PL84 as an EL84 equivalent, in reality PL84 is EL86 with a different heater
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Old 26th June 2006, 02:25 PM   #1118
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Hello,

Thank you all for your words! I am flattered to hear that Romanian is not so hard to puzzle out. And thank you Giaime for you've seen the mistake there.

I will modify there only after we speak a little and clarify some things. As far as I know, PL84 was used in TV and radio sets meantime EL84 was used in stereo commercial amplifiers. The difference between them is the voltage of the heater (and amps.). Is this right?

ALEKS
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Old 26th June 2006, 05:20 PM   #1119
Giaime is offline Giaime  Italy
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Hello Aleksandr,

you're welcome.

Yes tube names are often misleading. PL84/15CW5 is the "P" valve (that means SERIES 300mA heater connections) of the EL86/6CW5.
You can see from the triode mode curves
http://www.tubes.mynetcologne.de/roe..._as_triode.pdf
(thanks Tom!)
that it has a mu of about 7.5, gm = 7.5mA/V and rp ~ 1k.

EL84/6BQ5 has a mu of 17, an rp of 2k and a gm of 8.5mA/V, always in triode mode.

You can see that for PL84 the datasheets suggest replacing with:
http://www.nj7p.org/Tube1.php?tube=PL84

15CW5 (which is, aside from the heater, the same of 6CW5)
6HL5

and of course not 6BQ5.

As far as I know, there wasn't a P version of the EL84. But there are 10BQ5, 10GK6, 16GK6, 29GK6 that are meant for series string heaters.
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Old 26th June 2006, 06:03 PM   #1120
gianis is offline gianis  Greece
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Default acorn

Hi rdf, the 958 is a acorn type small tude with 1,25 v heaters, i use LM317 reg. and RC to reach this voltage. No hum at all, a gain about 10 , excellent tone and sound, but a litle bit microphonic.....i`ll try also with 955 tube [6,3 volt] Gianis
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