Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: kagliostro on June 11, 2016, 12:17:39 pm

Title: Is a 1629 tube usable as audio level meter ?
Post by: kagliostro on June 11, 2016, 12:17:39 pm

I tried a search but I find only schematics where the 1629 is used as a sintony indicator

Datasheet
http://www.mif.pg.gda.pl/homepages/frank/sheets/049/1/1629.pdf (http://www.mif.pg.gda.pl/homepages/frank/sheets/049/1/1629.pdf)

(http://www.mif.pg.gda.pl/homepages/frank/short/039/1/1629.gif)

(http://radioremembered.org/images/tuneye2.gif)

(http://thumbs.ebaystatic.com/images/g/BrcAAOSwT5tWMPUC/s-l225.jpg)

I would like to know if it is usable as an audio level indicator and be happy if someone has a schematic or link to share

Thanks

Franco

Title: Re: Is a 1629 tube usable as audio level meter ?
Post by: PRR on June 11, 2016, 02:08:22 pm

Golly. Many-many-many tape recorders used Eye-tubes as recording level indicators.

Bring your audio up to ~~8V peak. Rig a rectifier to get a negative output.

Old basic use-sheet: http://www.mif.pg.gda.pl/homepages/frank/sheets/021/6/6E5.pdf (http://www.mif.pg.gda.pl/homepages/frank/sheets/021/6/6E5.pdf)

Italian: http://www.mif.pg.gda.pl/homepages/frank/sheets/084/6/6E5GT.pdf (http://www.mif.pg.gda.pl/homepages/frank/sheets/084/6/6E5GT.pdf)

Title: Re: Is a 1629 tube usable as audio level meter ?
Post by: kagliostro on June 11, 2016, 02:22:17 pm

Thanks PRR

can the signal be take at the secondary of the OT ?

Thanks for the 6E5 datasheet

is the 1629 usable following same directives of other magic eyes tubes (when used as audio level meters) ?

Thanks

Franco


p.s.: Strange thing, I've found info about the use of the 1629 as amplifier ........... :huh:


(http://i.imgur.com/6JUqFwE.gif)


(http://i.imgur.com/CUKkFtU.gif)

Title: Re: Is a 1629 tube usable as audio level meter ?
Post by: PRR on June 11, 2016, 02:28:34 pm

Actually, in a tube guitar amp it may be easiest to take signal at the speaker jack.

Rectifier loading is a non-issue at such low impedance.

8V peak in 8 Ohms is only 4 Watts. Most amps exceed that. Bigger amps, put a pot before the rectifier.

Title: Re: Is a 1629 tube usable as audio level meter ?
Post by: kagliostro on June 11, 2016, 02:31:22 pm

Yet thanks

Franco

p.s.: Have you seen the p.s. I added to my previous post ? (  :huh:  )