How would the electrometer tube CV2269 sound with more than 1.2V at the Anode as a microphone booster preamplifier?

 

At your risk. A suitable fuse must be connected in series with any battery for injury or fire hazard protection.

 

The Pleiades V1 microphone booster preamplifier using the CV2269 operates with 1.2V for both heater and plate. See other posts for schematic.

Rethinking about it the plate voltage may be too low and the very very low plate current could be a cause of some hiss.

How would the CV2269 operate with grid at space potential (nothing connected to grid except the coupling capacitor after the input transformer)?

The electron tube has an amplification factor, μ=2.

So it should operate satisfactorily with V>2V. One has to be careful while increasing the battery supply volatge as electric field penatration to the grid (which is by default negative due to the electron cloud near cathode) will increase anode current rather abruptly.

(it is funny after a search on CV2269 electrometer tube, AI gives use as batterry operated microphone boosters, and after a search CV2269 electrometer tube microphone booster gives the Pleiades V1. But the schematic given is for the Pleiades V6 which is of the EF183 operated at an low anode poential of 3.6V.)

Some comments from John Simon on Producing Suzanne - Leonard Cohen

At your risk.

After an e-mail communication with the great producer on Suzanne - Leonard Cohen.

A link had been sent by e-mail to John Simon of this euroelectron post:

https://euroelectron.blogspot.com/2026/09/music-and-electronics-molecules-and.html

Below is the reply:

George.

Yes. You found me.

This is a lovely recording.

You are right that the recording of a singer who sings softly enables us to hear a far greater frequency range than that of a “screamer” or “belter” — so there is a level of personal intimacy present.

I was also the arranger for most of this album and I am proud of the use of female voices as a background element. They were all recorded in the same way. The mic in both cases were Neumann U-87s.

I did not produce or record several songs on the album because I had to move on to other projects at the time. For instance I did not record “Stories of The Street” or “Teachers”. But I believe I recorded all the rest.

There is a lot more lore from that era in my book, “Truth, Lies & Hearsay: A Memoir Of A Musical Life In And Out Of Rock And Roll” by John Simon.  Available from Amazon and wherever fine literature is sold.

Thanks for getting in touch.

Warmly,

 js

John,

Yes the girls sound like angels, don't they?

Is the reverb on the voices including Leonard's an echo chamber?

Warmly,

George

An old EMT “box”. About 6 feet long, 4 feet tall and 18” think. It had a plate in it.

Luck is not an Ally, it is the Result of Effort - Nikos Politis

 

At your risk.

From the great book of Nikos Politis that has come out in 2026 called Mirror:

Here is the link:

https://www.dioptra.gr/vivlia/psixologia-prosopiki-anaptixi/kathreftis

It would be nice if it is translated in all languages.

The Magic of music Cassettes

 

At your risk.

Yesterday in Athens' flee market called Monastiraki under the Acropolis, it was fun visiting the second hand music stores.

On one of them a cassette made in US was found with the title Dick Haymes Sings Irvin Berlin.

It was later played on a Grundig mono CR355.

The sound quality is fantastic. All the treble in the nice piano notes. The naturalness of the voice. It sounds as if the song is taking place inside the room.

This is one of the songs in this cassette:

A simple Melody, Pebble Drawing

 

At your risk.

Pebble Drawing

A   -   C   -                    chords:     A ie   A C E, 2nd time F7 ie F A C E

E   -    -     -                               

-    -    -     -  

D   C  B   C                                   

D   -   G    -                                   G6 ie G B E, 2nd time E7 ie E G B D

-     -     -    -

-    -     -     -

-    -     -     -

repeat, the second time last G is one octave up     

Writing notes with white ink

 

At your risk.

I tried a few day ago writing white notes on white music staff. 

The background was violet, the staff was white and the notes themselves white.

Erasing can be done by writing with violet.

It looks very nice.

 It was fun writing on a tablet with the tablet pen. 

I would like to have somehow virtual blank pages with 5 lines so that I could complete my book called The Melody Book. It has extracts of great songs played in the simplest possible way with the best possible sound quality on piano, using Bach's manual for his students rules.

I like the fact that notes can be written in white color. I could either try this way or acrylic white marker on paper.

Lupe

 

At your risk.

I had the pleasure of meeting met Michalis.

Here is music he makes: