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Thread: Energy usage- valve amp!

  1. #41
    Join Date: Sep 2017

    Location: Derbyshire

    Posts: 136
    I'm Martin.

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    Probably something like 10p/hour now.

    Certainly more than the EWA M50 power amp, less than a big Pass class A.

    Whilst it's obviously not the cheapest amp to run, it puts heat in the room, and sounds great.
    Given the hours you run it, it can't be the cause of your massive bills, surely.

  2. #42
    Join Date: Mar 2017

    Location: Seaford UK

    Posts: 1,861
    I'm Dennis.

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    Maximum theoretical efficiency of class A is 45%.

  3. #43
    Join Date: Jan 2008

    Location: Out on the wild and windy moors Lancs / Yorks Border

    Posts: 562
    I'm Andy.

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    If your Prima Luna is 300 watt, it's on 13 hours a week, assuming electricity costs 35p per kWh then that's about £1.37 a week plus your standing charge, plus all the other bits of kit you have turned on.

    I am all electric including an ASHP in a detached 4 bed bungalow in an exposed location with twin valve monoblocks, I burn 7000kWh annually so that's 7000x0.35=£2450 plus a couple of hundred standing charge. So my total is £2650/12=£221 per month

    Hope that helps
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  4. #44
    Join Date: Nov 2020

    Location: Leics

    Posts: 147
    I'm David.

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    Quick n easy check for you. Check your bill for the cost of a Kw/h, probably around 40p now.
    Tour your house and turn everything practical off at the wall (not the fridge freezer, I'd suggest), lights off, everything you can find off.
    Take a meter read. Let's say the read is 10000.
    Take another read after an hour without turning anything electric on (no cheeky cups of tea). If it's now 10002, you've used 2 Kwh's. At 40p per K/wh that's 80p.
    Now turn on and give your hifi a blast for an hour. If the meter's advanced from 10002 to 10007 that's 5 Kwh's at 40p each = £2.
    Two of those Kwh's are from the fridge (as per the first test) so your hifi's cost £1.20 for the hour.
    For reference, one of the biggest culprits is an electric water/immersion heater if you have one. They're the devil. Do NOT leave them on for any longer than strictly necessary.
    Mark Levinson 390 CD & Audiolab 6000 CD Transport / Soncoz SGD1 DAC / Croft 25RS Preamp / Croft 7R mono Amps / Neat Ultimatum XLS Speakers

  5. #45
    Join Date: Sep 2019

    Location: North Lincolnshire

    Posts: 202
    I'm Lloyd.

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    Quote Originally Posted by Stranraer View Post
    Quick n easy check for you. Check your bill for the cost of a Kw/h, probably around 40p now.
    Tour your house and turn everything practical off at the wall (not the fridge freezer, I'd suggest), lights off, everything you can find off.
    Take a meter read. Let's say the read is 10000.
    Take another read after an hour without turning anything electric on (no cheeky cups of tea). If it's now 10002, you've used 2 Kwh's. At 40p per K/wh that's 80p.
    Now turn on and give your hifi a blast for an hour. If the meter's advanced from 10002 to 10007 that's 5 Kwh's at 40p each = £2.
    Two of those Kwh's are from the fridge (as per the first test) so your hifi's cost £1.20 for the hour.
    For reference, one of the biggest culprits is an electric water/immersion heater if you have one. They're the devil. Do NOT leave them on for any longer than strictly necessary.
    Brilliantly simple way to work out and see the costs thanks for this idea
    A widower finding solace in music

  6. #46
    Join Date: Jan 2022

    Location: Bridlington

    Posts: 77
    I'm Shaun.

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    My power amp is Class A apparently and runs bloody hot so I have rigged up a USB fan above it to help to circulate the heat as it is sat on the bottom shelf of a heavy pine table. After an hour of use the room is notably warmer when we walk in. I need to calculate whether the amp is cheaper at heating the room than the radiators.

  7. #47
    Join Date: Jan 2022

    Location: Bridlington

    Posts: 77
    I'm Shaun.

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    Quote Originally Posted by Stranraer View Post
    Quick n easy check for you. Check your bill for the cost of a Kw/h, probably around 40p now.
    Tour your house and turn everything practical off at the wall (not the fridge freezer, I'd suggest), lights off, everything you can find off.
    Take a meter read. Let's say the read is 10000.
    Take another read after an hour without turning anything electric on (no cheeky cups of tea). If it's now 10002, you've used 2 Kwh's. At 40p per K/wh that's 80p.
    Now turn on and give your hifi a blast for an hour. If the meter's advanced from 10002 to 10007 that's 5 Kwh's at 40p each = £2.
    Two of those Kwh's are from the fridge (as per the first test) so your hifi's cost £1.20 for the hour.
    For reference, one of the biggest culprits is an electric water/immersion heater if you have one. They're the devil. Do NOT leave them on for any longer than strictly necessary.

  8. #48
    Join Date: Feb 2013

    Location: W Lothian

    Posts: 93,037
    I'm Grant.

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    Quote Originally Posted by Enossification View Post
    My power amp is Class A apparently and runs bloody hot so I have rigged up a USB fan above it to help to circulate the heat as it is sat on the bottom shelf of a heavy pine table. After an hour of use the room is notably warmer when we walk in. I need to calculate whether the amp is cheaper at heating the room than the radiators.
    the central heating will be more cost effective i guess but with the amp your getting 2 for one..
    Regards,
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  9. #49
    Join Date: Jan 2022

    Location: Bridlington

    Posts: 77
    I'm Shaun.

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    Quote Originally Posted by struth View Post
    the central heating will be more cost effective i guess but with the amp your getting 2 for one..

  10. #50
    Join Date: Jan 2022

    Location: Bridlington

    Posts: 77
    I'm Shaun.

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    OK so my observation of our smart meter display was as good as my knowledge of electronics. My amp consumes 720 Watts when switched on giving a cost of around 27 pence per hour. Even on standby my amp consumes 70 Watts or so. What a bloody time to buy the amp you always dreamed of owning.

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