Versions the ECC81 comes in are:

• ECC81/12AT7, ECC81 and 12AT7 are exactly the same, 12AT7 is the USA name and ECC81 is the name used in Europe. The CV455, CV8154, CV9859, CV10662 are the militairy numbers for these tubes.
• 6201, 12AT7W(A)(B)(C), 6060, E81CC are the special quality long life versions of the ECC81/12AT7. These tubes mostly has thicker mica for lower microphonics and extra support rods for more stabilisation, etc. Later ECG (Philips) version do not have these extra's and shouldn't be called 6201/12AT7WA. The gold pinned versions are often also called ECC801S. The CV4024 and CV5212 the the militairy versions of the 12AT7WA and 12AT7WB respectively.
• The M8162 is the English version of the CV4024, one of the best sounding 12AT7's ever made.
• The 6679 is the mobile version of the ECC81. It is the same as the ECC81, but can maintain good specs with a variation of +/- 20% of the heater power.
• 7728 is the premium instrument grade tube made only by CBS/Hytron. This tube has heavily plated gold pins.
• ECC801(S) is the premium version of the European ECC81. These tubes were made and tested for low microphonics and low noise. The "S"-version is specially selected for low noise.
• The B309 is the old English version of the ECC81. This is the real vintage and very rare.

6201, 12AT7W(A)(B)(C), 6060, E81CC

Type	Description	State	Brand	Number in stock	Price each (Euro)
12AT7WA	Rounded plates, D-getter, gold label, triple mica. Pulls from militairy equipment (with low or no hours)	NEW	Sylvania picture	1	24.50
E81CC	O-getter, Mullard factor codes	NOS	Labelled RTC	1	24.50
E81CC	O-getter on double support	NOS	RTC	2 single 2 pair	24.50 59.00 (pair)
6201	Extra support rods, O getter, made by GE	NOS	Hewlett Packard	3 single 2 pairs	19.50 49.00 (pair)
GB6201	Gold brand, black plates, copper grid rods, O getter on double supports, testing like NOS	USED	RCA	1	24.50
6201 / 12AT7WA	Black plates, triple mica	NEW	Raytheon	1	20.00
JAN-12AT7WA	Grey plates, Disk getter, extra support rods, matched pair	NEW	GE	1 pair	42.00 (pair)
6201 *****	Grey plates, disk getter	NEW	GE	1	19.00
6201	Grey plates, made by GE, disk getter	NEW	CEI	1	19.00
6201 / JAN-12AT7WC	Grey plates, O getter, copper grid rods	NEW	GE	1 single 2 pairs	21.00 49.00 (pair)
6201 / JAN-12AT7WC	Grey plates, O getter	NEW	GE	1	19.00
6201	Grey plates, O getter	NEW	GE	1	19.00
6201	O-getter, Made by Valvo, pulls with very low or no hours, testing like NOS	USED	Labelled Philips Miniwatt	1 single 4 pairs	18.00 45.00 (pair)
6201	Extra support rods, black plates, copper grid rods, O getter. Pulls from militairy equipment, testing like NOS	USED	RCA	1 single 3 pairs	11.50 28.00 (pair)

ECC81 and 12AT7

Type	Description	State	Brand	Number in stock	Price each (Euro)
ECC81	O-getter, labelled Telefunken, no <> bottom, made by Siemens	NEW	telefunken	1	19.50
ECC81	O-getter, black coated plates, copper grid rods, BVA label. Made in England	NEW	Brimar	1	29.50
ECC81	O-getter, BVA shield logo, pair testing 9/10 and 10/11 mA	NEW	Mullard	1 pair	52.00 (pair)
ECC81	O-getter, labelled Pope	NOS NEW	Made by Mullard	1 1	24.50 22.00
12AT7	O-getter, shield logo, pair testing 12/12 and 10/13 mA	NEW	Mullard BVA	1 pair	42.00 (pair)
ECC81	O-getter, Mullard Blackburn factory codes, in white cases (bulk pack)	NOS	Labelled Philips	2 single 3 pairs	22.00 49.00 (pair)
ECC81	D-getter, labelled Pope	NEW	Made by Philips	1	28.00
ECC81	D-getter, labelled Adzam	NEW	Made by Philips	1	28.00
ECC81	O-getter, La Radiotechnique factory codes, in white cases (bulk pack)	NOS	Labelled Philips Miniwatt	2 single 4 pairs	22.00 49.00 (pair)
ECC81/12AT7	O-getter, Siemens factory codes, made in Germany	NOS	Siemens	1 single 4 pairs	27.50 64.00 (pair)
ECC81	O-getter, labelled Philips Miniwatt	NOS	Made by Siemens	1	26.50
ECC81	O-getter	NEW	Siemens	2 single	21.00
ECC81/12AT7	O-getter, on original Siemens boxes	NOS	Probably Tungsram	1 single 5 pairs	16.50 39.00 (pair)
ECC81	O-getter	NEW	Tungsram	1	14.00
ECC81	O-getter	NOS	RFT	1	14.00
ECC81	O-getter, yellow text	NEW	RFT picture	5 single 3 pairs	13.50 29.00 (pair)
ECC81	Disk getter	NEW	RFT	1	12.00

ECC801S

Type	Description	State	Brand	Number in stock	Price each (Euro)
Most of the times 6201/E81CC are also called ECC801S, please take a look in my 6201/E81CC list for these types available

M8162

Type	Description	State	Brand	Number in stock	Price each (Euro)
M8162 / CV4024	O-getter, very nice construction, double thick mica	NEW	Mullard Mitcham factories	1	44.00
M8162 / CV4024	O-getter, grey plates, R productioncodes, KQDD/K 84-18 date codes, very good sounding tubes, selected types of the normal CV4024 KQDD/K	NOS	Mullard Picture	5 singles 40 pairs	19.00 54.00 (pair)

CV4024 and CV5212

Type	Description	State	Brand	Number in stock	Price each (Euro)
CV4024	O-getter, grey plates, R productioncodes, KQDD/K 84-05 date codes, very good sounding tubes	NOS	Mullard	4 pairs	44.00 (pair)
CV4024	O-getter, grey plates, R productioncodes	NEW	Mullard	1	21.00

B309

None in stock at the moment, please check back soon

CV455, CV8154, CV9859, CV10662

None in stock at the moment, please check back soon

6679

None in stock at the moment, please check back soon

7728

None in stock at the moment, please check back soon