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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment. |
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10th Oct 2019, 11:04 am | #1 |
Diode
Join Date: Oct 2019
Location: East Kilbride, South Lanarkshire, Scotland, UK.
Posts: 4
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How to fit a pilot light to a Philips NG5155 amplifier?
Hi all,
Long time lurker, first time poster here. So, I aquired a NG5155 valve record player. All working fine, the electrics had all been modernised with new resistors and capacitors etc but the casing and turntable was damaged beyond repair. I removed the electrical section and will rehouse and adapt it to use as an mp3/turntable amplifier. The original record player never had a bulb to show whether it was on or off - I would like to fit one, but am unsure the easiest and safest way to do it. I was thinking of using the on/off switch pot lugs to attach it to - am I on the right lines ? I think I'd rather have a bulb with 'jewel cover' unit (like a guitar amp) than an LED. Any help would be gratefully appreciated, thanks |
10th Oct 2019, 11:21 am | #2 |
Dekatron
Join Date: Nov 2003
Location: Heckmondwike, West Yorkshire, UK.
Posts: 9,642
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Re: How to fit a pilot light to a Philips NG5155 amplifier?
The safest way would be to use a 6.3v filament bulb wired across the valve heaters, but a mains neon as you suggest will be OK.
THe circuit is the same as the NG5055: https://www.service-data.com/section.php/6168/1/ng5055 |
10th Oct 2019, 2:15 pm | #3 |
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,535
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Re: How to fit a pilot light to a Philips NG5155 amplifier?
Some odd "Philipsisms" in the amplifier- volume controls have some odd frequency shaping and whilst there're bias resistors for each output valve, they're in parallel with a single bypass capacitor
Maybe two small resistors were cheaper than one big one?
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10th Oct 2019, 2:35 pm | #4 | |
Nonode
Join Date: Oct 2014
Location: West Midlands, UK.
Posts: 2,181
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Re: How to fit a pilot light to a Philips NG5155 amplifier?
Quote:
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10th Oct 2019, 5:27 pm | #5 |
Dekatron
Join Date: Nov 2003
Location: Heckmondwike, West Yorkshire, UK.
Posts: 9,642
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Re: How to fit a pilot light to a Philips NG5155 amplifier?
The OP doesn't want an LED though.
Item 3 here is the classic: https://mullard.org/collections/comp...-lights/bulgin |
14th Oct 2019, 12:36 am | #6 |
Diode
Join Date: Oct 2019
Location: East Kilbride, South Lanarkshire, Scotland, UK.
Posts: 4
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Re: How to fit a pilot light to a Philips NG5155 amplifier?
Hi there,
Apologies for not getting back sooner. Thank you all for the help and information, it was greatly appreciated. |