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Which tube does my amp use? 845 or 211
Which tube does my amp use? 845 or 211
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Old 7th November 2010, 10:51 PM   #21
Zen Mod is offline Zen Mod  Serbia
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Which tube does my amp use? 845 or 211
Quote:
Originally Posted by manp111 View Post
Zen Mod,

Do you have experience measuring or working on amplifiers?
more than 20 yrs of service work
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Old 7th November 2010, 10:52 PM   #22
tinitus is offline tinitus  Europe
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since this amp is without tubes, one could suspect it to have a failure

if so, this seems like it could be really tricky

I think a real expert is needed
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Old 7th November 2010, 10:59 PM   #23
HP8903B is offline HP8903B
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I really appreciate all of your concerns.
I will do more research on safety tips. So far I know to wear shoes with rubber sole, wear rubber gloves, and only use one hand whenever possible.

I live in Austin, TX
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Old 7th November 2010, 11:05 PM   #24
HP8903B is offline HP8903B
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Quote:
really though, start this amp with a varible transformer.
I don't have a variable transformer. I do have five 120V to 100V stepdown transformers. I could plug several or all five of these in series to get the input voltage down. Then remove each one as I want to raise the input voltage. What do you think of this method?
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Old 7th November 2010, 11:07 PM   #25
HP8903B is offline HP8903B
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Quote:
since this amp is without tubes, one could suspect it to have a failure

if so, this seems like it could be really tricky

I think a real expert is needed
Yeah, you might be right.

Right now I just want to determine whether it uses 845 or 211. If it is not working then I will deal with it another way.
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Old 7th November 2010, 11:08 PM   #26
pieter t is offline pieter t  Netherlands
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Since you live in Austin TX ask SY
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Old 7th November 2010, 11:09 PM   #27
pieter t is offline pieter t  Netherlands
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I think SY is also the right guy to slow you down a bit....
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Old 7th November 2010, 11:16 PM   #28
HP8903B is offline HP8903B
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Who is SY?
I tried to look up SY but couldn't find this member.
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Old 7th November 2010, 11:16 PM   #29
tomtt is offline tomtt
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Quote:
Originally Posted by manp111 View Post
I live in Austin, TX
you might be able to get some pizza outa this.

Sy?



Quote:
Originally Posted by manp111 View Post
I don't have a variable transformer. I do have five 120V to 100V stepdown transformers. I could plug several or all five of these in series to get the input voltage down. Then remove each one as I want to raise the input voltage. What do you think of this method?

i'd have to be present, to make any sort of call about this.
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Old 7th November 2010, 11:25 PM   #30
HP8903B is offline HP8903B
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If I plug in all 5 120V to 100V transformers one after another, I will bring the voltage down to about 50V going in the amp.

Are you recommending using a variable transformer so that I can work with a lower voltage at first? Any lower input voltage will not give me an accurate reading.
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