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  4. » Amplifier kt88 - 6C5 SE (A) - Detail

 
Amplifier kt88 - 6C5 SE (A) - Detail...

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Amplifier kt88 - 6C5 SE (A) - Detail sent on March 02, 2020 (15:47) by Alessandroprof. 10 comments, 646 views. [retina]

at 36mm, 20 sec f/11.0, ISO 100, tripod.

Particolare della GEB KT88 in funzione. Si noti la versione metallica della 6C5, originale RCA. Ingrandendo a pieno formato, si possono vedere gli elemanti interni della KT88.



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avatarsenior
sent on March 02, 2020 (22:37) | This comment has been automatically translated (show/hide original)

Nice fat the KT88 ! Have you ever done anything with the 807 ???

avatarsenior
sent on March 02, 2020 (22:42) | This comment has been automatically translated (show/hide original)

Actually, no. But do you know that the 807 sits apart from the 6L6GA only by the shape? They have the same characteristics.
By, have you seen the receiver wiring?

avatarsenior
sent on March 03, 2020 (0:00) | This comment has been automatically translated (show/hide original)

I really like the big bottle shape of the various 6L6/KT88/6P3P, while I am puzzled by that type kt88, or even the linear shape of the EL34: they have less charm.
Seen now the receiver: it's super ordered! Congratulations! ... but it's without quarts ???? How do you do with the various frequency drifts?

avatarsenior
sent on March 03, 2020 (0:20) | This comment has been automatically translated (show/hide original)

This is the Chinese amp with 6P3P. I would say that it is definitely more messed up, despite trying to make order in some way in the very approximate instructions for wiring, kindly accompanied by clear indications to ideograms ...
[IMG2]3501200[/IMG2]

avatarsenior
sent on March 03, 2020 (1:33)


This comment is too long to be automatically translated, so it will be shown in its original language (Italian)  

Click here to translate the comment in English [en]


Il tuo cablaggio non è male.

Per quanto riguarda la deriva in fequenza del ricevitore, essendo realizzato con oscillatori liberi, essa è abbastanza stabile. Ho stabilizzato la tensione delle due oscillatrici con dei diodi Zener (si vedono in basso, accanto i due elettrolitici da 22mfd 350V) e utilizzato dei condensatori di accordo ceramici a tubetto ad alta stabilità, con il trucco di accopiarli con stabilità contrarie. Mi spiego meglio: i condensatori a tubetto hanno derive termiche calibrate. Essi si trovano con valori di stabilità da -150, 0, +220, +330PPM etc... Accoppiandoli opportunamente la deriva è veramante trascurabile, e se unita alla tensione stabilizzata si può paragonare ad un quarzo. Ovviamente durante l'ascolto prolungato bisogna agire, con sapienza, mediante i due condensatori variabili ad aria (si vedono in alto), di piccola capacità che fanno da verniero. Per il riferimento di frequenza, dato che non è dotato di scala, mi affido al frequenzimetro esterno, collegato con un piccolo link (non si vede perchè coperto dalle due stecche di legno) alla sezione oscillatrice della ECH42.


avatarsenior
sent on March 03, 2020 (1:36) | This comment has been automatically translated (show/hide original)

Tomorrow, I'm going to post more photos with details of other amps.

avatarsenior
sent on March 03, 2020 (10:16) | This comment has been automatically translated (show/hide original)

The trick of tube capacitors is very interesting! I'm waiting for the amps.

avatarsenior
sent on March 03, 2020 (10:19) | This comment has been automatically translated (show/hide original)

I'm taking pictures.... :-D

avatarjunior
sent on May 17, 2020 (1:13) | This comment has been automatically translated (show/hide original)

I saw a movie on National geographic of how the valves are built.... Wonderful....

avatarsenior
sent on May 17, 2020 (5:37) | This comment has been automatically translated (show/hide original)

I was born there with valves....... thank you for the passage.


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