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Old 9th Sep 2020, 9:14 pm   #1
yakxx21
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Default R1155 Resistor wattage?

Whilst I have a list of R values required to replace many of the resisters in an old R1155 ( which all seem to be miles out) I cannot find any data to tell me the wattage required...and I find it hard to calculate as some power supplies seem to be at 270v Ht+ to Ht- whilst others seem to be much lower .... .If I take the screen grids for instance...they say they should be approx 60-80 volts.... mine are nearer to 110 V ....and the screen resister network works out that I need resisters of over 1 watt.....ie.. 240 volt Ht to earth , 23K and 27K in series for screen voltage .

Is there a rule of thumb for wattage for all the resisters ( other than R1) or is there a list some where....
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Old 9th Sep 2020, 9:32 pm   #2
M0FYA Andy
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Default Re: R1155 Resistor wattage?

Are you replacing them with modern resistors? If so, just use 2 watt or greater types as they will then also be physically large enough to look 'at home'.

Andy
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Old 9th Sep 2020, 11:33 pm   #3
yakxx21
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Default Re: R1155 Resistor wattage?

Yes ... Modern metal film I guess..... so 2 watt will be good for all...thanks
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Old 10th Sep 2020, 8:51 am   #4
lesmw0sec
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Default Re: R1155 Resistor wattage?

Quote:
Originally Posted by M0FYA Andy View Post
Are you replacing them with modern resistors? If so, just use 2 watt or greater types as they will then also be physically large enough to look 'at home'.

Andy
Worth doing in any case - the disspation in resistors fitted to valve equipment can be surprisingly high. It is easy to forget this after working extensively on low-voltage, low current semiconductor stuff!
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Old 10th Sep 2020, 9:08 am   #5
CambridgeWorks
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Default Re: R1155 Resistor wattage?

Quote OP : .and I find it hard to calculate as some power supplies seem to be at 270v Ht+ to Ht- whilst others seem to be much lower ....
I thought the R1155 was around 210V ht?
Rob
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Old 10th Sep 2020, 10:18 am   #6
HamishBoxer
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Default Re: R1155 Resistor wattage?

Think you are right ,around 210V.
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