Help required to finish a valve project - please

If they glow, this is the place to be
Post Reply
Blues45
User
Posts: 13
Joined: Sun Nov 12, 2017 2:08 pm

Help required to finish a valve project - please

Post by Blues45 » Fri Feb 02, 2018 5:08 pm

Hi, Friend of mine had a go at building a Headphone Amplifier. He lives in London and I live in Oldham, Lancs - the amp is currently with me. It is built but has a couple of issues - one being MONO when it should be Stereo, and the other issue being HUM.

Any kind soul out there who might be able to assist????


Thanks.

RhythMick
User
Posts: 128
Joined: Fri Jun 23, 2017 12:24 pm

Re: Help required to finish a valve project - please

Post by RhythMick » Fri Feb 23, 2018 9:44 am

Is there a circuit diagram ?

How far did the build get ? Does the one channel work ?

Firebottle
User
Posts: 66
Joined: Mon Jul 21, 2014 7:50 am
Location: The Black Country

Re: Help required to finish a valve project - please

Post by Firebottle » Mon Apr 30, 2018 6:16 pm

Does the amplifier have floating heaters, i.e. no connection to the signal ground at all? This can cause hum issues.

If the output is in the form of a cathode follower then a raised bias voltage is probably necessary to avoid excess heater cathode voltages on all the valves.
Don't you just love valve phono stages 8)

Post Reply

Who is online

Users browsing this forum: No registered users and 6 guests