Sep 18, 2010 · The only way I can see of getting 25W from a quad of EL84s is to drive them into class AB2. Data sheet shows 17W per pair in class B, so AB2 should be good for over 22W and less than 34W. Hmmm.

Aug 19, 2013 · The easiest way to do AB2 is to use a driver tube as a cathode follower to feed the power tube grids direct connected, ie no blocking cap, after the PI. The driver cathode follower allows the power tube to draw much more current than in AB1, so more power.

Title: EL84 Author: Mullard Subject: FP-2002-02-16 Created Date: 2/17/2002 1:22:39 AM

Aug 16, 2020 · to fully drive the EL84 I need around 25 Vpp (a bit more if I want to reach AB2) up to ten times (to be conservative) the bandwidth, so 200 kHz, so slewrate will be: 2 x pi x f x V = 2 x 3,14 x 200 kHz x 25 = 31,4 V/us

Mar 7, 2017 · 6L6 has an AB2 rating. It shows 14V positive peaks, which seems to be (from 807 data) 20mA peak grid current, which is in the ballpark of the 0.1W-0.2W grid power specified (on 807) for AB2 use.

Feb 26, 2013 · I tried with EL84's, PCL82's and 6V6's. I also tried something halfway, i.e. a shared small resistor + a number of 5W zener diodes in series to fairly regulate the G2 supply. This simple solution was already a good improvement.

The EL84 is a vacuum tube of the power pentode type. It is used in the power-output stages of audio amplifiers, most commonly now in guitar amplifiers, but originally in radios. The EL84 is smaller and more sensitive than the octal 6V6 that was …

Dec 6, 2007 · This is classic class A operational setup for a single EL84. 50ma is the maximum recommended sustained plate dissipation for the EL84 in SE Pentode operation. We should remember that it is class AB1/2, Class B and Class C amps which "idle", relative to absolute current draw, whilst Class A amps are always-on, full-tilt current sinks, no matter ...

Nov 25, 2020 · If you want to go push pull then ideally you want to use class A. But that will not give you more power than Parallel SE. Main reason Push Pull came into vogue was the cheaper construction and running in AB / AB1 /AB2 or class B which looses fine details at low levels. (manufacturers making more money - more power for the same amount)

Jan 31, 2012 · Would it be ok to run a trioded 6bq5/el84 in class a2? If so would a 12au7 cathode follower source enough current to do it? The idea is to try a very simple two tube amp with the 12au7 side of a 12dw7 configured as a cathode follower to drive the grid of the el84. ~Austin