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

vampyretim · 11th Jun 2019, 9:18 am

Hi guys,

As requested a picture of the layout.

Yes, I do have a scope. I always thought that push pull amplifiers tended to cancel out most hum, I can see saw tooth ripple on the output valves anodes.

The amp seems well built to me.

I'll get a trace of the hum and find out frequency etc in a bit. I have modded a Dansette A35 with a hum dinger before and it worked very well.

I was very careful when recapping this 5-10 to make sure that there was still only one earthing point on the chassis which is at the BNC input.

11th Jun 2019, 9:18 am	#14
vampyretim Heptode Join Date: Aug 2011 Location: Bristol, UK. Posts: 538	Re: Mullard 5-10 amplifier Hi guys, As requested a picture of the layout. Yes, I do have a scope. I always thought that push pull amplifiers tended to cancel out most hum, I can see saw tooth ripple on the output valves anodes. The amp seems well built to me. I'll get a trace of the hum and find out frequency etc in a bit. I have modded a Dansette A35 with a hum dinger before and it worked very well. I was very careful when recapping this 5-10 to make sure that there was still only one earthing point on the chassis which is at the BNC input. Attached Thumbnails Last edited by vampyretim; 11th Jun 2019 at 9:26 am.