6L6 5881 CV1948 VT107 BEAM TETRODE VARIOUS MANUFACTURERS.

Beam tetrode output valve
Manufacturers: Brimar , Ediswan , Mullard , Raytheon , RCA , Sylvania

The 6L6 was first introduced by RCA in 1935 and interestingly enough, the first version had a metal envelope and was the first true beam tetrode ever made – ANYWHERE!

All the successive versions however, had a glass envelope and over the years we worked through the 6L6G, 6L6GA, 6L6GB, 5881, 5932, 7027, and the final version 6L6GC The voltage and power rating of the 6L6 series were gradually enhanced by the addition of features such as a Micanol base, thicker plates, thicker grid wires, grid cooling fins, and ultra-black anode coatings such that the original having a 19 watts dissipation was ‘hot-rodded’ to give 30W by the time 6L6GC came around.

Lateral development of the 6L6 occurred with the 6V6 being developed for domestic radio and car radio applications and of course the 807 for radio transmitter PA usage

6L6's working in class AB2 push pull had the potential to deliver 50 Watts for less than 2%THD – quite a feat!

This impressive performance allied to longevity in service makes them keenly sought for audio and guitar amplifier applications today
 

 

Picture of  MULLARD AMERTY RED INK 6L6 BEAM TETRODE
MULLARD AMERTY RED INK 6L6 BEAM TETRODE
On offer is a particularly nice 6L6 by Mullard as part of their Amerty brand.. Print is slightly smudged in red ink. The story gets better for we have tested it using our AVO VCM 163 Against the nominal AVO specification for 100% emission of :- Ia =54mA; gm = 5.2 mA/V @ Va = 250V; Vg = -15V Obtained results were:- Device 1: Ia = 55 mA; gm = 4.8 mA/V As you can see, these values meet the nominal specification for a new device.
Stock Code: 805
Availability: 1 in stock
Delivery date: 1 week
€39.93
Picture of MULLARD AMERTY 6L6 BEAM TETRODE
MULLARD AMERTY 6L6 BEAM TETRODE
On offer is a particularly nice 6L6by Mullard as part of their Amerty brand.. Print is slightly smudged in white ink. The story gets better for we have tested it using our AVO VCM 163 Against the nominal AVO specification for 100% emission of :- Ia =54mA; gm = 5.2 mA/V @ Va = 250V; Vg = -15V Obtained results were:- Device 1: Ia = 50 mA; gm = 5.0 mA/V As you can see, these values meet the nominal specification for a new device.
Stock Code: Y77
Availability: 1 in stock
Delivery date: 1 week
€68.45
Picture of RCA 6L6G KT66E TETRODE
RCA 6L6G KT66E TETRODE
On offer is a particularly nice 6L6G by RCA also labelled as a KT66E. The story gets better for we have tested it using our AVO VCM 163 Against the nominal AVO specification for 100% emission of :- Ia =54mA; gm = 5.2 mA/V @ Va = 250V; Vg = -15V Obtained results were:- Device 1: Ia = 50 mA; gm = 4.9 mA/V As you can see, these values meet the nominal specification for a new device.
Stock Code: Y68
Availability: 1 in stock
Delivery date: 1 week
€39.93
Picture of  US NAVY CRC 6L6M BY RCA
US NAVY CRC 6L6M BY RCA
On offer is a particularly nice 6L6M by RCA. The story gets better for we have tested it using our AVO VCM 163 Against the nominal AVO specification for 100% emission of :- Ia =54mA; gm = 5.2 mA/V @ Va = 250V; Vg = -15V Obtained results were:- Device 1: Ia = 46 mA; gm = 4.8 mA/V As you can see, these values meet the nominal specification for a new device.
Stock Code: n2
Availability: 1 in stock
Delivery date: 1 week
€15.97
Picture of ADMIRALTY RED PRINT (AMERTY MULLARD) 6L6 BEAM TETRODE
ADMIRALTY RED PRINT (AMERTY MULLARD) 6L6 BEAM TETRODE
On offer is a particularly nice RCA 6L6. Print is perfect on the base in white ink and the envelope carries an etched cartouche too. The story gets better for we have tested it using our AVO VCM 163 against the nominal AVO specification for 100% emission of :- Ia =54mA; gm = 5.2 mA/V @ Va = 250V; Vg = -15V Obtained results were:- Ia = 65 mA; gm = 4.7 mA/V As you can see, these values meet the nominal specification for a new device.
Stock Code: Y54
Availability: 1 in stock
Delivery date: 1 week
€39.93
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