replacing E188CC with E88CC

[JLS]

I will try to replace the E188CC with E88CC in rec/playback amplifiers in a
STUDER C 37/J 37 tube taperecorder.

I know there are some difference between the tubes.
but will it make a big difference in sound/noise-levels etc?

Thanks

Jens

[Franz Hamberger]

JLS <jl...@c2i.net> schrieb in im Newsbeitrag:
Tl_75.18835$R7.33...@juliett.dax.net...

Hello,

since the E188CC is an audio-grade low-noise version of the
E88CC (which was originally designed for VHF applications),
you might get a higher noise level using the E88CC instead
of an E188CC in pre-amplifier stages. Other electrical
parameters are identical.

Franz

--
Franz Hamberger, Berlin, Germany, franz.h...@gmx.de
My Online European Tube Charts - Tubes & Valves Database
http://people.freenet.de/radiolabor/index.html and
http://www.ginko.de/user/franz.hamberger/index.html#tubes

[HANS NICKOLAS WILSON]

I thought the E188CC/7308 was the military version of the E88CC/6922. The
only difference in specs is that E188CC has a 10% higher powerdissipaition
capacity, (2.2watts vs 2watts), as well as 35mA higher heatercurrent, (335mA
vs 300 mA). Which is why I use it since I run as high a current through tha
preamp as possible. Noise-wise I heard no difference.
Nick

Franz Hamberger <hitch...@alpha-centauri.net> wrote in message
news:3961...@news.ginko.net...

[Darryl]

Hi HANS NICKOLAS WILSON,

You were saying......

>I thought the E188CC/7308 was the military version of the E88CC/6922. The
>only difference in specs is that E188CC has a 10% higher powerdissipaition
>capacity, (2.2watts vs 2watts), as well as 35mA higher heatercurrent, (335mA
>vs 300 mA). Which is why I use it since I run as high a current through tha
>preamp as possible. Noise-wise I heard no difference.
>Nick
>
>

Just recently I had some discussions with people about E88CC/6922's. They were
looking for low noise and low microphoney. The E188CC never came up, but I
think in general, running the current high, as you do, is good design to reduce
these problems. I'll bet those preamps that don't, are the ones causing these
people to search for low noise/microphony versions of this family of tubes.
Maybe they need to tweak the design a bit?

Dazz