UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Mullard 5-10 amplifier

vampyretim · 18th Jun 2019, 11:06 am

Hi all,

I've done all voltage readings as per Mullard circuits for audio amplifiers (with Avo 8 mostly on 1000v setting).

EF86
A-140V
S-70V
K-1.7V

ECC83
A-230V
A1-210V
G-50V
G1-50V (the hiss disappears when I take this voltage reading)
K-55V
K1-55V

EL84 1
A-335V
S-340V
K-12V

EL84 2
A-335V
S-340V
K-13V

Could hiss be caused by R6? I will try a replacement shortly.

18th Jun 2019, 11:06 am	#62
vampyretim Heptode Join Date: Aug 2011 Location: Bristol, UK. Posts: 538	Re: Mullard 5-10 amplifier Hi all, I've done all voltage readings as per Mullard circuits for audio amplifiers (with Avo 8 mostly on 1000v setting). EF86 A-140V S-70V K-1.7V ECC83 A-230V A1-210V G-50V G1-50V (the hiss disappears when I take this voltage reading) K-55V K1-55V EL84 1 A-335V S-340V K-12V EL84 2 A-335V S-340V K-13V Could hiss be caused by R6? I will try a replacement shortly.