Watford Valves, one of Europe's leading suppliers of tested, graded and guaranteed valves to the professional music industry. We offer some of the most comprehensive testing facilities available today. Jan 13, 2006 · The 12BH7A is electrically identical to the 12BH7. The only difference between the two is that the heater of the 12BH7A is designed for use in series-string heater circuits in TV sets (the tube was used as a vertical oscillator/output tube in TV's, as well in other applications). www.jj-electronic.sk 15 Dimension and connections: 14 ECC99 ECC99 R. F. DOUBLETRIODE Base: NOVAL U f = 6,3 or 12,6 V I f = 800 or 400 mA Typical characteristic: U a = 150 V U g = -4 V I a = 18 mA The JJ ECC99 is used as a driver in 300B and 2A3 amps, a preamp tube, a output tube in headphone amps, just to name a few.
Title: Doc1.PDF Author: Unknown Created Date: Tuesday, April 09, 2002 9:50:08 PM Feb 02, 2018 · 12AU7 medium mu tubes are widely used for pre and driver circuit. compatibility between 12AU7 and 12BH7 have been one of questions among DIY builders. This video answers for the question.
"Ei-RC" - Electronic tubes factory Data Sheet ECC81/12AT7 Page 1 of 4 Telephone: +381 18 550 741 ECC81 is R.F. Double Triode Quick reference data • Anode current Ia=10mA • Transcoductance S=5,5mA/V • Amplification µ=60 Heating Heating is indirect by AC od DC, with serial or parallel supply. Please note that, in case of Jun 24, 2014 · I believe the 12BH7 has the same current draw as an ecc99. Both are pin for pin compatible. You need to make sure that the power transformer can handle the increase in heater current. Current is rated differently depending if a 6.3v or 12v heater supply is used. 12AU7 draws 150ma with heater wired to 12v and 300ma with 6.3v. 6GU7 IS a 12BH7 with a 6.3 volt filament. Look at the specs. 5687 looks good on paper and is fine for some things but when I tried rewiring an Altec 1569 to use them, there were problems with excessive control grid current tossing the voltages off. Replacing with 7119/E182CC fixed the problem (and E1822CC can swing a pile of voltage).
Sep 26, 2009 · Same adapter as for the 12a*7 & 12bh7 The MPX3 puts about 160V on the plate of the "bottom" triode in the WCF, which looks like a nice voltage for the ECC99 BUT! I would note that the ECC99 will draw about twice as much current as 6sn7 in an MPX3 (about 25mA vs 8-12mA depending on exactly how the amp was built) This puts you very close to the ... NEW MILITARY TESTED PAIR 6N6P-I ~ ECC99 E182CC 6N30P 12BH7 GOLD GRID 80`s. Novosibirsk tube plant. Date mid 80`s . Warmed , tested and measured on calibrated L3-3 tube tester (Uf=6.3V, Rk=68 , Ua=120V) The measured parameters ( S and Ia for each half tube ) are attached to each tube ! Please ask for actual tubes parameters and date.
MINIATURE DOUBLE TRIODE(LOW-MU), 12BH7 datasheet, 12BH7 circuit, 12BH7 data sheet : GEC, alldatasheet, datasheet, Datasheet search site for Electronic Components and Semiconductors, integrated circuits, diodes, triacs, and other semiconductors. The 12BH7 is like a 12AU7, but has higher power handling capability. I'd recommend selling it to someone with a McIntosh tube amp, an SVT or a headphone amp that uses them as output tubes. In the first two cases, the 12BH7 is the only tube that'll do the job, so it seems to me it would find a better home with folks who can't sub something in ...
Title: 12BH7A Author: General Electric Subject: JA-FP-2001-01-23 Created Date: 1/23/2001 10:41:14 PM 6GU7 IS a 12BH7 with a 6.3 volt filament. Look at the specs. 5687 looks good on paper and is fine for some things but when I tried rewiring an Altec 1569 to use them, there were problems with excessive control grid current tossing the voltages off. Replacing with 7119/E182CC fixed the problem (and E1822CC can swing a pile of voltage). Aug 08, 2013 · I just received my VTL Siegfried Series 2 amps from VTL and they use 12BH7 tubes as driver tubes (2 per mono block). VTL uses the Electro Harmonix 12BH7 tubes and for an input tube they use the JJ12AT7 tube. The JJ 12AT7 tube is awful sounding as I have been experimenting with several different NOS tubes that are far away better sounding.
Feb 12, 2010 · (2) The 12BH7 requires no circuit modification to substitute for a 12AU7, but the plate resistance is a little lower (5300 vs 7700). Thus, even though it has a lower u (or amplification factor), the gain may be slightly higher depending on the circuit design. [This is mainly true for circuits that use an anode resistor load.] Have anyone used ECC99 as a replacement for 12AX7? if so, how is it?