The GAKKEN Vacuum Tube Radio Ver. 2

Dear all,

the tube (valve) radio came alive ... in the 'GAKKEN Vacuum Tube Radio Ver. 2', released in October 2006:

enjoy from http://www.hlj.com/product/gak62133



The manufacturers website http://www.gakken.co.jp/ is Japanese language only,
try Altavista (for a less helpful translation).

Maybe one of our Japanese members could help with details?

Kind Regards
Georg

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Dear gentleman

I am an old radio boy living in Tokyo. Please call me Taizo.

In Japanese, “Gakken” is the language which omitted the meaning of “study research”.
Gakken is the company who sells books, magazine, the assembly kit, etc. various
for boys and girls for education
The head office is located in the town near-by in which I live.

This radio is the goods conceived in order to use the primitive radio-tubes(battery-operated)      in large quantities and was hit by chance in China
which is sold as one of the science kit series for not only boys and girls, for "grown-up”.

The vacuum tubes currently used are 1K2 (1T4/DF91), 1 B-2 (1S5/DAF91), and 2P2 (3S4/DL92).

About the loud-speaker, the volume is increased with the plastic horn (D150mm)
from mini size (D22mm) speaker.

The cases are made with all plastics.

Price is about 10000 Japanese Yen.

This radio is an object for the study of a principle, and does not become practical use.
Probably, it will be good for decoration of the room.

Many thanks!      Taizo

 

Attachments:

• cover page (107 KB)
• schematic (147 KB)

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Dear Taizo

We are very glad to see the first post from Japan!
Three members yet are listed from Japan - but none did anything yet for RMorg - but you.
This is most common also for other countries - never mind.

I know that Japan has a very long tradition for radios - what is commonly not known here in Europe - and I think also in the USA it is not known generally. Japan has been recognised as a "copier" at the beginning of transistor radios but Japan has made major inventions (like the special variable condenser) for such objects.

Therefore it would be grat if you could persuade your radio friends in your country to play an active role here in RMorg. Every day more than 100 000 pages are opened worldwide from RMorg. Therefore your work will really be seen.

If you run into problems for putting in new models or loading up pictures etc. please click the blue info buttons and if that does not help you please write by using the contact form for help. The contact form can be found on each page in the bottom link "Contact".

Because this is a very special piece I hope the admins don't mind if you put this up as a new model (for 1999 because this is "the last year" we accept at present). I think the schematic is also a nice example how to use the tubes DF91, DAF91 and DL92 in a straight forward, simple way for experiments.

I have just introduced "your" tubes as 1K2 1B-2 AND 2P2. Please write them the same way including capital letters. Thank you. You are welcome.

Cordially,
Ernest 

Change on 10 Nov 2007:
Contact form entered instead of link (SPAM ...)

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I changed the 1B-2 to 1B2_1S5 to distinguish from the US ballast tube and to be conform with the schematic (1B2 is given, not 1B-2). Hopefully we are on the right track ;-)

In such cases we use the "underligne sign" because this has not been used by the makers. Quite often you find same tube designations for quite different tubes. If a tube often is written in different ways we may use code-9-entries to show which is our name for it and that we don't get models with different naming for the same tube.

We still have to change the tube line up of the model which I have put in question in the thread in German. Maybe there are two different versions of the model (or some errrors). We have to stick to the uploaded schematic.

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For those who are not able to buy this set (it seems to be sold out):

A fan from Toronto has made a nice video demonstration about unpacking, assembling (and listening to), the Ver.1
http://www.youtube.com/watch?v=fmVC6HqEWYYYou need Flashplayer installed to enjoy.

GR

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