Versions the ECC88 comes in are:

• ECC88 / 6DJ8, ECC88 and 6DJ8 are exactly the same, 6DJ8 is the USA name and ECC88 is the name used in Europe. The ECC88 / 6DJ8 must only be used in parallel heater configurations.
• The 7DJ8 / PCC88 are the 0.3A series heater current versions of the ECC88 / 6DJ8. The Heater voltage is 7V. The PCC88/7DJ8 can be used in parallel and series heater configuration.
• The E88CC / 6922 are the premium military versions of the ECC88 / 6DJ8. Again the E88CC is the European name and 6922 is the USA name. Mostly these tubes have goldpins. Sometimes these tubes come with pinched waists, the glass has been clamped at the place of the top-mica.
• The E188CC / 7308 tubes are the special matched section, low noise and microphonics version of the E88CC/6922.
• The E288CC / 8223 are absolute top sounding special quality E188CC / 7308. They are not exactly the same as the E88CC / 6922. They work for example at a little more heater current (0.475A against 0.3A), please take care your amp can deliver this. Also they have different amplification and plate impedance, but this is not problem in common E88CC circuits.
• The CCa is the special quality version of the ECC88 made by Siemens.
• The CV2492 is the English army made version of the E88CC.
• The Russian near equivalent of the ECC88 / 6DJ8 is the 6H1pi. Same pinout and nearly the same specs, only higher heater current (600 mA instead of 300 mA) and lower gm (5 instead of 12). If your heater supply can handle this, this tube is interchangable.
• The old production Russian premium E88CC / 6922 is the 6H23pi. It is directly interchangable, it has the same specs and pinout. This tubes sounds very well, and is very well made. This tube beats the crap out of modern Russian tubes and even some of the European and USA NOS tubes! The 6H23pi-EB is the long life special version of this tube.

Note: As far as I know Amperex never produced any E88CC theirselves. Amperex bugle boy are (like the Philips SQ E88CC!) in fact made in the Philips Heerlen factory in The Netherlands (triangle date code). They all have the circular getter shield above the upper mica with the two raised rectangular sections on opposite edges of the shield. Also they have the four ridges on the top of the glass. They have gold pins, but do not have a number printed at the bottom (so there are not Siemens).

CV2492

Type	Description	State	Brand	Number in stock	Price each (Euro)
CV2492	O-getter, 4B1/1778 datecode, testing good	USED	Brimar	1	19.00

E88CC / 6922

Type	Description	State	Brand	Number in stock	Price each (Euro)
E88CC	Goldpinned, O-getter	NOS	Siemens	1	39.00
E88CC	Goldpinned, large O-getter, getter shield, 7L6 and 7L8 Philips Heerlen datecodes, in original Valvo boxes, red label	NOS	Labelled Valvo	1 pair	139.00 (pair)
6922	O-getter, Philips Heerlen datecode, Amperex Bugle boy logo, testing like NOS	USED	Amperex PQ	1	35.00
E88CC	Goldpinned, O-getter, testing good	USED	Philips Miniwatt SQ	2	22.50
E88CC	Goldpinned, O-getter, testing good	USED	Philips SQ	8 single 2 pairs	17.50 45.00 (pair)
E88CC	Goldpinned, Disk-getter, testing good	USED	Philips SQ	1	14.50
JAN 6922	Goldpinned, O-getter, 1969 date code, testing good	USED	Philips	1	18.00
6922	O-getter, gold pins, Amperex USA *-datecode, Perfect text, probably pull from very low hour equipment, testing like NOS. Datecode 1966	USED	Amperex PQ	1	55.00
6922	O-getter, gold pins, Amperex USA *-datecode, Red text, Beckman, made in USA, testing like NOS. Datecode 1961	USED	Amperex PQ	1	45.00
E88CC	Goldpinned, normal grids. NOS Tesla, no JJ. O-getter, red tip. Very good sounding (a bit like Telefunken) and high quality tubes, made in Czechoslovakia. In militairy box	NOS	Tesla picture	6 single 10 pair	28.00 59.00 (pair)
E88CC	Goldpinned, normal grids. NOS Tesla, no JJ. O-getter, very good sounding (a bit like Telefunken) and high quality tubes, made in Czechoslovakia. In white box, pulls from unused militairy equipment, directly from the Czech army.	USED	Tesla picture	6 single 10 pair	19.00 47.50 (pair)
E88CC	Goldpinned, gold plated grids. NOS Tesla, no JJ. O-getter, very good sounding (a bit like Telefunken) and high quality tubes, made in Czechoslovakia. In white box, pulls from unused militairy equipment, directly from the Czech army.	USED	Tesla picture	5 single	22.00
6922-EH	gold plated pins	NNP	Electro-Harmonix	2 single 4 pairs	17.50 39.50(pair)
E88CC	Goldpinned, O-getter	NOS	Edicron	1	22.00
E88CC	Goldpinned, O-getter, gold plated grids, very special and good sounding tubes	NOS	RFT	3 single 1 pair	28.50 74.00 (pair)
E88CC	Goldpinned, O-getter, gold plated grids, very special and good sounding tubes. Labelled ECC88	NOS	RFT	1 single 1 pair	24.50 64.00 (pair)
E88CC	Goldpinned, Probably made by Tungsram, O-getter, Picture	NOS	Labelled RSD	1	17.50

E188CC / 7308

Type	Description	State	Brand	Number in stock	Price each (Euro)
JAN 7308	O-getter, getter shield, gold pins, Green Amperex globe logo. VR5/*.. Amperex USA codes, dated 1970. Internally matched, not a matched pair	NOS	Amperex	2 single	45.00
USN 7308	O-getter, getter shield, red label, datecode 1965, pair testing 14/12 and 13/11 mA	NOS	Raytheon picture	1 pair	80.00 (pair)
USN 7308	O-getter, getter shield, red label, datecode 1965	NOS	Raytheon picture	2	35.00
JAN 7308	O-getter, getter shield, green label, datecode 1970	NOS	Sylvania	1	22.00
JAN 7308	O-getter, getter shield, green label, datecode 1970, pair testing 14/16 and 15/18 mA	NOS	Sylvania	1 pair	59.00 (pair)
JAN 7308	O-getter, getter shield, green label, datecode 1976	NOS	Sylvania	1 single 1 pair	22.00 54.00 (pair)
JAN 7308	O-getter, getter shield, blue label, datecode 1986, pair testing 19/24 and 17/22 mA	NOS	Made in USA	1 pair	39.00 (pair)

ECC88 / 6DJ8

Type	Description	State	Brand	Number in stock	Price each (Euro)
ECC88	O-getter, in original case	NOS	Philips Miniwatt	1	29.00
ECC88	O-getter	NEW	Philips Miniwatt	2	22.00
ECC88	O-getter, Testing like NOS	USED	Amperex Bugle Boy	2	20.00
ECC88	Old production (not JJ), made in Czechoslovakia, O-getter	NEW	Tesla picture	9 single 12 pairs	14.50 35.00 (pair)

PCC88 / 7DJ8

Type	Description	State	Brand	Number in stock	Price each (Euro)
PCC88	O-getter, testing good, no <> bottom, Siemens factory codes	NOS	Labelled Telefunken	1	32.00
PCC88	O-getter, getter shield, Foreign made BVA (Eastern Germany)	NOS	Labelled Mazda	3	8.00

E288CC / 8223

E288CC	Gold-pin, O-getter, getter shield. Different label and boxes, same series, testing 38/40 and 42/38 mA. Pulls, testing like NOS, very good text, same datecodes. Great pair for Ah! Njoe Tjoeb CD-player	NOS?	Telefunken picture (alike)	1 pair	169.00 (pair)
E288CC	Gold-pin, O-getter, getter shield. Different label and boxes, same series, testing 42/34 and 38/34 mA. Pulls, testing like NOS. Great pair for Ah! Njoe Tjoeb CD-player	NOS?	Telefunken picture (alike)	1 pair	139.00 (pair)
E288CC	Gold-pin, O-getter, getter shield. Same series, testing 38/28 and 32/24 mA. Pulls, testing like NOS. Great pair for Ah! Njoe Tjoeb CD-player	NOS?	Telefunken picture (alike)	1 pair	139.00 (pair)
E288CC	Gold-pin, O-getter, getter shield. Different label and boxes, same series, testing 30/30 and 34/32 mA. Pulls, testing like NOS. Great pair for Ah! Njoe Tjoeb CD-player	NOS?	Telefunken picture (alike)	1 pair	129.00 (pair)
E288CC	Gold-pin, O-getter, getter shield. Testing 22/38 mA. Pulls, testing like NOS.	NOS?	Telefunken picture (alike)	1	59.00 (pair)

6H23pi

6H23pi-EB	Russian direct replacement for the E88CC (see text above). They have quite good sound for the money, very nice tubes. 1985-1988 production, in original case	NOS	Russian NOS	1 single 10 pairs	17.50 37.50 (pair)

6H1pi

6H1pi	Russian replacement for the ECC88 (see text above). Voskod factory logo	NOS	Russian NOS picture	11 single 8 pairs	2.40 7.50 (pair)