Hacker Gondolier GP42 and AL41 Amp - UK Vintage Radio Repair and Restoration Discussion Forum

dekor8tor · 21st May 2018, 10:10 pm

Hi all need a little help with my setup.

Both amps have a very loud humming especially when the volume is turned up and more so on the AL41 amp.

As far as I know both amps have Mullard mustards, is there anything else I need to change?

Thanks.

GrimJosef · 21st May 2018, 11:10 pm

I would start by working out what the fault is. That way you won't change anything pointlessly. Mullard mustards are normally extremely reliable.

Cheers,

GJ

RojDW48 · 21st May 2018, 11:34 pm

As a very general rule - volume dependent hum is a grounding issue - check the connections from the cartridge through to the amp(s).

Edward Huggins · 22nd May 2018, 9:44 am

Is there still hum when the stereo adaptor is completely dissconnected and you are running the GP42 as a standalone player. There may be an earth loop.

dekor8tor · 22nd May 2018, 9:43 pm

thanks all with your answers i will check to see if it is humming with the lead disconnected.

21st May 2018, 10:10 pm	#1
dekor8tor Triode Join Date: May 2016 Location: Cannock, Staffordshire, UK. Posts: 41	Hacker Gondolier GP42 and AL41 Amp Hi all need a little help with my setup. Both amps have a very loud humming especially when the volume is turned up and more so on the AL41 amp. As far as I know both amps have Mullard mustards, is there anything else I need to change? Thanks.

21st May 2018, 11:10 pm	#2
GrimJosef Dekatron Join Date: Sep 2007 Location: Oxfordshire, UK. Posts: 4,311	Re: Hacker Gondolier GP42 and AL41 Amp I would start by working out what the fault is. That way you won't change anything pointlessly. Mullard mustards are normally extremely reliable. Cheers, GJ __________________ http://www.ampregen.com

21st May 2018, 11:34 pm	#3
RojDW48 Nonode Join Date: Jun 2014 Location: Bristol, UK. Posts: 2,074	Re: Hacker Gondolier GP42 and AL41 Amp As a very general rule - volume dependent hum is a grounding issue - check the connections from the cartridge through to the amp(s). __________________ '....don't go mistaking Paradise for that home across the road!' (Bob Dylan)

22nd May 2018, 9:44 am	#4
Edward Huggins Dekatron Join Date: Sep 2015 Location: Southwold, Suffolk, UK. Posts: 8,326	Re: Hacker Gondolier GP42 and AL41 Amp Is there still hum when the stereo adaptor is completely dissconnected and you are running the GP42 as a standalone player. There may be an earth loop. __________________ Edward.

22nd May 2018, 9:43 pm	#5
dekor8tor Triode Join Date: May 2016 Location: Cannock, Staffordshire, UK. Posts: 41	Re: Hacker Gondolier GP42 and AL41 Amp thanks all with your answers i will check to see if it is humming with the lead disconnected.