Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: kagliostro on October 27, 2014, 06:45:25 pm

Title: I just discovered that 6ak5 tubes where used in Microphones
Post by: kagliostro on October 27, 2014, 06:45:25 pm

Till now I was thinking that the 6ak5 tube was used in AF circuits only by some DIYer pioneer

the tube is indicated to be used in low noise RF amplification at VHF

I was always thinking that this small tube worth some interest and now I discovered it was used by some brands in the construction of Tube Mic

http://www.filmsoundsweden.se/backspegel/sela.html (http://www.filmsoundsweden.se/backspegel/sela.html)

http://recordinghacks.com/microphones/Oktava/MKL-5000 (http://recordinghacks.com/microphones/Oktava/MKL-5000)

http://recordinghacks.com/microphones/CAD/Trion-8000 (http://recordinghacks.com/microphones/CAD/Trion-8000)

don't you think that this tube should be experimented more intensely in AF circuits ?

K

Title: Re: I just discovered that 6ak5 tubes where used in Microphones
Post by: PRR on October 27, 2014, 11:31:26 pm

6AK5 is the earliest in a LOOONG line of VHF amplifiers. It is a fine tube. Some of the later ones are better in some way (or they wouldn't be made).

So many tubes. So little time.

Title: Re: I just discovered that 6ak5 tubes where used in Microphones
Post by: sluckey on October 28, 2014, 12:25:34 am

I believe Geezer and Tubenit were experimenting with the 5654 back in the days when they first started exploring pentode circuits. IIRC they had favorable results.

Title: Re: I just discovered that 6ak5 tubes where used in Microphones
Post by: kagliostro on October 28, 2014, 01:18:14 am

Geezer and Tubenit tried the tube but as far as I can Know they abandoned kit in favour of the 5879 tube

Franco

Title: Re: I just discovered that 6ak5 tubes where used in Microphones
Post by: DummyLoad on October 28, 2014, 01:25:31 am

So many tubes. So little time.

i know, right...

http://tubedata.milbert.com/sheets/123/6/6AG9.pdf (http://tubedata.milbert.com/sheets/123/6/6AG9.pdf)

was thinking a 3-tube amp. push-pull with paraphase made of 6AK9 triodes and maybe a submini driver.

--pete

Title: Re: I just discovered that 6ak5 tubes where used in Microphones
Post by: kagliostro on October 28, 2014, 01:57:39 am

And also for the 6AG9 the price is tempting  :grin:


http://www.fourwater.com/compact/comp_c31.htm (http://www.fourwater.com/compact/comp_c31.htm)


Franco