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6GB8 data sheet translation needed
6GB8 data sheet translation needed
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Old 18th July 2013, 04:08 AM   #1
rtch is offline rtch  New Zealand
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Default 6GB8 data sheet translation needed

Hi, are there any Japanese-speaking (or, rather, Japanese-reading) forum members who would be able to translate some bits of the Toshiba 6GB8 tube datasheet? I have a handfull of used ones, they look good at Pa 35W, Pg2 10W, 130W from a pair in AB1, and I'll be happy to trade a couple of them for a translation of at least the non-guessable parts. I attach a part of the data sheet, at the moment I'm particularly interested in what seems to be SE pentode operation at 250V (p1, LH column) yielding 15W, but I can't figure out what is 20 m-ohms, what is 15K ohms, and what is 15 (the line above the 1,600ohm load). But I'd like also to understand the 320V/40W p-p and what seems to be the triode operation on the lower right. The power-crazies amongst us may be interested in the fixed-bias p-p figures.
please pm me if you wish
cheers from New Zealand
rtch
Attached Files
File Type: pdf 6G-B8 Hi-Fi p1 50%.pdf (407.9 KB, 161 views)
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Old 18th July 2013, 09:33 AM   #2
Rod Coleman is offline Rod Coleman  United Kingdom
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6GB8 data sheet translation needed
I can start the translation, at least:

The regime is "Single A1" and Application: (can't read it)

- The 20m Ohms is given as the Transconductance so a think they mean 20m Mho (20mA/V);
- the 15K ohms is "Plate inner resistance", i.e. Ra

Next, "Push-Pull AB1"
Va=Vg2=320V
"cathode resistor": 60 ohm
load: 2500 ohm

Table, first row: "Grid 1 signal input voltage rms"
2nd row "plate current"
3rd row "grid 2 current"
4th row "output"
5th row distorton

Yes, the last application has "2nd grid bound to plate"
Table, first row: "Grid 1 signal input voltage rms"
2nd row "plate current"

etc

Then, the triode-mode PP mode is given.
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Old 24th July 2013, 09:07 AM   #3
rtch is offline rtch  New Zealand
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Thanks, Rod, would you like a couple of used ones to play around with, if I can figure out how to safely get them to you from NZ?
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Old 7th May 2017, 07:51 PM   #4
Jimmy84 is offline Jimmy84  Russian Federation
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Hello Rod. Would you be so kind as to translate a single end section?

Thanks in advance!
Andrew.
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Old 8th May 2017, 04:05 PM   #5
Ketje is offline Ketje  Belgium
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Look at Frank's tube data site for the 8417.
Mona
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Old 8th May 2017, 04:47 PM   #6
Rod Coleman is offline Rod Coleman  United Kingdom
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6GB8 data sheet translation needed
Quote:
Originally Posted by Jimmy84 View Post
Hello Rod. Would you be so kind as to translate a single end section?

Thanks in advance!
Andrew.
OK, it says

Single Class A

Va=Vg2=250V
Vg1=-8V
Cathode Resistor 57Ω
Internal Plate resistance 15KΩ
Output Load 1600Ω

G1 Drive V ... Plate Current mA ... G2 current mA ... Output W ... Distortion%

0V .................... 140.................... 12 ................... - ................... -
3.2 V ................. 145 ................. 16 ................. 6 ................. 5.8%
4.65V ................. 149................. 21.5 ............... 12 ................. 8.1%
3.2 V ................. 151 ................. 28 ................. 15 ................. 9.5%


それらのPenthodesをお楽しみください!


ロッド

Enjoy those Pentodes! -Rod
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Old 8th May 2017, 08:34 PM   #7
Jimmy84 is offline Jimmy84  Russian Federation
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Thank you guys!!!

I have one more question if you don't mind.
Are a driven voltage of G1 in RMS or peak value?

Many Thanks!
Andrew.
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Old 8th May 2017, 08:43 PM   #8
Jimmy84 is offline Jimmy84  Russian Federation
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P.S. And what is a value "15" between 15k and 1600ohm. Is it a value and are you sure it is?
Thanks.
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