ECC32 CV181 CV1988 13D2 B65 6SN7GT TWIN TRIODE VALVE VARIOUS MANUFACTURERS

Octal twin triode valve
The 6SN7GT double triode valve is electrically equal to a pair of the 6J5 triodes in a single envelope. The construction uses a glass pinch and the two separate electrode structures are visible through the envelope. The wide glass tube envelope is 27 mm in diameter and excluding the IO base pin length, stands 63 mm high. Type 6SN7GT was first introduced in 1940. 

The B65 Marconi-Osram audio variant with it’s distinctive metal clad octal base was first introduced in 1948.

The Mullard ECC32 ST shaped variant is perhaps the first variant as it was issued in late 1939, long before the advent of the Noval valve base and the dinky ECC83, the ECC32 was the valve of choice for low noise audio applications. Mullard describe the ECC32 as a double triode with separate cathodes for use as a paraphrase AF amplifier and in phase inverters. The electrode assembly although smaller than other double triodes of the period has supreme rigidity due to the glass pinch mounting mode. The curved anodes do much to increase surface area allowing impressive anode dissipation whilst enhancing rigidity and the sonic purity this can provide.

This Octal triode is favoured for many guitar and classic valve amplifiers, the most renowned being the Leak TL12 0.1 of 19467, however, it is surprising which other well regarded and modern exotica also demands fine devices of this type:-

Aesthetix Calypso
Antique Sound Lab AQ1006 Mono Block amps
Atma-Sphere MA-1 Mk II.2 Amplifier
Audio Aero Prestige mono amps
Audio Note 300B amp
Audio Note conquest
Audio Aero Capitole
Cary CAD 300SEI
CARY SLP 05 preamp
CJ MV55
Conrad-Johnson CAV-50 intergrated amp
Dehavilland Ultraverve linestage
Deja Vu Audio Type 45 amp
Modwright Sony 5400ES
Oppo/Modwright BDP-95
Rogue Audio 99 Magnum
Singlepower headphone amp
Singlepower PPX3-SLAM
Singlepower SDS-XLR
TransTRAC amp
VAC Renaissance 30/30 MKIII
Yagin CD3 Tube buffer
Yaqin MS-34C

Woo WA-5

 

 

Picture of MULLARD CV181 MIL SPEC ECC32  BROWN BASE 1954 MANUFACTURE
MULLARD CV181 MIL SPEC ECC32 BROWN BASE 1954 MANUFACTURE
This EX EQUIPMENT TESTED example carries only a slightly smudged military cartouche in white print and shows a production date of March 1954. The base is brown low loss micanol and is tightly secured to the glass envelope All pins are bright and corrosion free. This device is used, ex equipment but has been tested using my AVO VCM 163 valve tester and as you can see from the test data presented below, it gives data for anode current, Ia and mutual conductance gm that is within nominal Mullard 100% emission spec:- At Va = 250V Vg = -4.6V Section 1: Ia = 6.0 mA; gm = 1.7 mA/V Section 2: Ia = 7.0 mA; gm = 2.0 mA/V The specification for a new/100% emission valve is: Ia =6.0mA; gm = 2.3mA/V As you can see, these results show a strong device with extremely good matching of each triode section within each valve envelope.
Stock Code: b88
Availability: 1 in stock
Delivery date: 1 week
$253.90
Picture of STC FOOTSCRAY FAT BROWN BASE CV1988 MILITARY 6SN7GT 1958 MANUFACTURE
STC FOOTSCRAY FAT BROWN BASE CV1988 MILITARY 6SN7GT 1958 MANUFACTURE
We have on offer today, one of these sonically lush high performance triodes. It carries military markings in white ink which are slightly smudged but due to factory code and notation, there is no doubting this beauties provenance for it's one of the famed Footscray CV1988 with black glass on the fat brown micanol base. This device shows full emission and superb matching for each triode section within each envelope - a hallmark of a good valve.
Stock Code: C41
Availability: 1 in stock
Delivery date: 1 week
$74.22
Picture of BRIMAR FOOTSCRAY FAT BLACK BASE ORANGE PRINT 6SN7GT 1958 MANUFACTURE
BRIMAR FOOTSCRAY FAT BLACK BASE ORANGE PRINT 6SN7GT 1958 MANUFACTURE
We have on offer today, one of these sonically lush high performance triodes. The device carries markings in orange ink on the fat black micanol base, the 6SN7GT etched block on the glass envelope and an etched batch code. This device was produced at the STC Footscray works. This device shows good emission and close matching for each triode section within each envelope - a hallmark of a good valve.
Stock Code: B7
Availability: 1 in stock
Delivery date: 1 week
$74.22
Picture of BRIMAR FOOTSCRAY TALL BOY  BLACK GLASS BLACK BASE SILVER PRINT 6SN7GT 1950S MANUFACTURE NOS BULK PACKED
BRIMAR FOOTSCRAY TALL BOY BLACK GLASS BLACK BASE SILVER PRINT 6SN7GT 1950S MANUFACTURE NOS BULK PACKED
We have on offer today, one of these sonically lush high performance triodes. The device carries markings in silver ink on the fat black micanol base, the envelope is carbonised black glass 2 inch high. This device was produced at the Brimar - STC Footscray works. This device shows good emission and close matching for each triode section within each envelope - a hallmark of a good valve.
Stock Code: b50
Availability: 1 in stock
Delivery date: 1 week
$117.18
Picture of MULLARD BRITISH MADE MEDIUM ENVELOPE OLD SHIELD 6SN7GT  BLACK BASE CLEAR GLASS MANUFACTURE
MULLARD BRITISH MADE MEDIUM ENVELOPE OLD SHIELD 6SN7GT BLACK BASE CLEAR GLASS MANUFACTURE
We have on offer today, one of these high performance triodes which presents the sound stage with a lush midrange and top bass registers whilst the top end remains silkysmooth without headroom roll-off. A signature characteristic of these is supreme female voice reproduction. This 1.75" height glass envelope sports the Mullard old shield and 6SN7GT notation in white ink. This device shows good emission and close matching for each triode section within each envelope - a hallmark of a good valve.
Stock Code: S11
Availability: 1 in stock
Delivery date: 1 week
$48.17
Picture of MATCHED PAIR OF BRIMAR FOOTSCRAY TALL BOY  BLACK GLASS BLACK BASE SILVER PRINT 6SN7GT 1950S MANUFACTURE
MATCHED PAIR OF BRIMAR FOOTSCRAY TALL BOY BLACK GLASS BLACK BASE SILVER PRINT 6SN7GT 1950S MANUFACTURE
We have on offer today, a beautiful matched pair one of these sonically lush high performance triodes. These devices carry markings in silver ink on the fat black micanol base, the envelope is carbonised black glass 2 inch high. Both were produced at the Brimar - STC Footscray works. Both devices show good emission and close matching not only for each triode section within each envelope but inter valve too.
Stock Code: b50 b52
Availability: 1 in stock
Delivery date: 1 week
$227.85
Product tags