UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Mullard 3 watt amp

Valvepower · 4th Dec 2010, 10:55 pm

Hi,

Tony, no problem I’m glad it was of interest as I felt it was different enough to the Mullard publication to be intresting, plus The Radio Constructor articles make an intresting read.

One of the advantages of DC coupling there is one less phase shift to worry about.

I feel this circuit is really innovative with the DC coupling, and is more than just an EF86 driving an EL84 as used elsewhere.

When replacing the valves one should consider the seesaw action in the DC coupling between the anode of the EF86 and the grid of the EL84 and between the cathode of the EL84 and the screen of the EF86 to get the best performance.

Terry.

4th Dec 2010, 10:55 pm	#19
Valvepower Octode Join Date: Aug 2008 Location: Rayleigh near Southend-On-Sea, Essex, UK. Posts: 1,883	Re: Mullard 3 watt amp - gobsmacked ! Hi, Tony, no problem I’m glad it was of interest as I felt it was different enough to the Mullard publication to be intresting, plus The Radio Constructor articles make an intresting read. One of the advantages of DC coupling there is one less phase shift to worry about. I feel this circuit is really innovative with the DC coupling, and is more than just an EF86 driving an EL84 as used elsewhere. When replacing the valves one should consider the seesaw action in the DC coupling between the anode of the EF86 and the grid of the EL84 and between the cathode of the EL84 and the screen of the EF86 to get the best performance. Terry.