EL34HJ Power Tubes

Introducing the classic power EL34HJ power tube by Harry Joyce USA with unmatched vacuum with dynamic range and tone that your amp deserves. Experience the magic of Harry Joyce  EL34 tubes  for a fraction of NOS prices with the High Quality you expect from Harry Joyce USA

Customer Testimonial:

A wise man once told me: “You can’t improve upon perfection.”

Such is proven true in respect to the El34HJ tube set.

Placing the golden pins of the tubes into the socket of my amp, I could feel the pressure it took to put these tubes in the amp, knowing that solid connection alone would make a drastic improvement over the last set of vintage Marshall Tesla’s I had in previously.

The moment my amp turned on I could already hear a difference without even playing one note. Striking that first chord, I could immediately notice a more defined mid range and clear highs that I never had before using the Tesla’s.

Overall, the Harry Joyce EL34 dual set is worth every penny because tubes aren’t made like this anymore. Even if you spent hundreds of dollars and hours of your time scouring the internet for vintage Mullard’s or Brimars, it still wouldn’t stand up to the HJ’s.

Like I said before, “You can’t improve upon perfection.”

Harry Joyce Customer for Life !

Offered in Pairs ( 2 Tubes per order ) 

Heater
UH……………………………6.3 V
IH……………………………1.5 A
Maximum Rating
Ua……………………… 800 V
Ug2………………… 500 V
Ug1………………… -100 V
Pa………………… 25 W
Pg2…………… 8 W
Ik………………………150 mA
Rg1
with cathode bias………………………0.7 MΩ
with fixed bias……………………0.5 MΩ
Uh-k………………±100 V
Tbulb………………………250 ℃
Direct Interelectrode Capacitances
Input…………………… 15.2 PF
output…………………… 8.4 PF
Grid to plate …………………… 1.1 PF
Grid to filament ……… 1.0 PF
Cathode to filament…………… 10 PF
Static Parameter
Ua…………………………… 250 V
Ug2……………………………250 V
Ug3…………………………… 0 V
-Ug1…………………………12.2 V
Ia…………………………… 100 mA
Gm…………………………… 11 mA/V
ri…………………………… 15 kΩ
μg1-g2………………………11
Recommended Operating Conditions(reference value)
Class A1.single tube.fixed bias
Ua(b) …………………… 265 265 V
Ua……………………………250 250 V
Ug2……………………… Rg2=2k Rg2=0
Ug3……………………………0 0 V
-Ug1……………………… 14.5 13.5 V
Ia(0) ………………………70 100 mA
Ig2(0) …………………… 10 14.9 mA
Gm…………………………… 9 11 mA/V
ri……………………………18 15 kΩ
RL…………………………… 3 2 kΩ
Pout………………………… 8 11 W
Dtot…………………………10 10%
Push-pull.classB1.fixed bias
Ua……………………………375 400 V
▲Rg2………………………… 600 800 Ω
Ug3………………………… 0 0 V
-Ug1………………………… 33 36 V
Ia(0) …………………2×30 2×30 mA
Ia(maxsig) ………2×107.5 2×110.5 mA
Ig2(0) ………………2×4.7 2×4.5 mA
Ig2(maxsig) ………2×23.5 2×23 mA
Rl(a-a) ………………3.5 3.5 kΩ
ü(g1-g1)(r.M.S) ……… 46.7 50 V
Pout……………………48 54 W
Dtot……………………2.8 1.6 %
▲ Rg2 is used in two tubes
Push-pull.classB1.cathode bias.ultra-linar connection.
(43% tapping points)
Ua………………………………430 V
Rg2…………………………… 2×1 kΩ
Ia(0) ………………………2×62.5 mA
Ia(max.sig) ……………… 2×65 mA
Ig2(0) ………………………2×10 mA
Ig2(max.sig) …………… 2×10.2 mA
Rk……………………………2×470 Ω
?(g1-g1)(r.M.S) ……………35 V
RL(a-a) ……………………… 6 kΩ
Pout……………………………20 W
Dtot………………………… 0.35 %