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  #1  
Old 29th March 2017, 06:47 PM
bob orbell bob orbell is offline
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Default Valve heater voltage.

Hi all, a question if I can, today I found that my Pre power supply has a faulty regulator, and the Pre valve heaters have been running with 8.9 volts for just over a week, it all came to light today because it just did't sound right, harsh in the mid band, the regulator has been changed and the heater volts are back to 6.3, should I junk the two tubes E88CC gold pin Mullards, it sounds better, but there is still some harshness. BOB
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  #2  
Old 29th March 2017, 07:24 PM
John Caswell John Caswell is offline
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Default Re: Valve heater voltage.

Hi Bob,
As the valves have been overrun for over a week I would junk them. It has probably reduced their life to quite a degree.

John
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  #3  
Old 29th March 2017, 07:38 PM
bob orbell bob orbell is offline
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Default Re: Valve heater voltage.

Thank's John, I was afraid that would be the answer, . BOB
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  #4  
Old 29th March 2017, 08:25 PM
Richard Richard is offline
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Default Re: Valve heater voltage.

They are quite expensive Bob so feel free to pop them in the post and I can test them for you.

They are indirectly heated so, as long as the filament didn't melt, they may just have used up a little extra of their life the past week. The tester will show up a weak valve (usually due to old age)
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Old 29th March 2017, 09:29 PM
bob orbell bob orbell is offline
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Default Re: Valve heater voltage.

O dear, they both got chucked in the bin just after I replied to John, one still survives though, I have been looking for replacements, you are correct about the price, , I can send the remaining one to you Richard if you PM me your address, as I don't keep any members address. Thank's. BOB
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  #6  
Old 30th March 2017, 09:22 AM
Richard Richard is offline
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Default Re: Valve heater voltage.

Morning Bob, address sent. It would be interesting to know how it tests but the postage for just one may not be worth it esp if it's u/s.
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Old 30th March 2017, 09:54 AM
bob orbell bob orbell is offline
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Default Re: Valve heater voltage.

Thank's Richard, I will send it to you for test, if it's US, it should fit in your bin OK , if it test's OK, I will reimburse you the postage, thank's again. BOB
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  #8  
Old 30th March 2017, 10:09 AM
John Caswell John Caswell is offline
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Default Re: Valve heater voltage.

Hi Bob,
PM me with address and I will stick a couple of them in the post. I hate to see a grown man cry

John
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  #9  
Old 30th March 2017, 12:55 PM
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Greg. Greg. is offline
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Default Re: Valve heater voltage.

That's very generous! He's a very nice man, you know
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  #10  
Old 30th March 2017, 01:28 PM
bob orbell bob orbell is offline
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Default Re: Valve heater voltage.

Quote:
Originally Posted by John Caswell View Post
Hi Bob,
PM me with address and I will stick a couple of them in the post. I hate to see a grown man cry

John
Well, that is most generous John and a big thank you. The tears are welling in my eye's as I type. PM to follow. BOB
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