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 Post subject: Sub for 5V4?
PostPosted: Feb Sun 18, 2018 4:04 pm 
Member

Joined: Jan Wed 11, 2012 4:21 pm
Posts: 717
Location: Elko, MN.55020
In need of a 5V4 tube.
Friend told me a 5Y3 can be used as a sub.
Don't see that one listed as a sub on the tube website.
Anyone care to comment on this?
Murf


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 Post subject: Re: Sub for 5V4?
PostPosted: Feb Sun 18, 2018 5:00 pm 
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Joined: Nov Sun 04, 2007 6:01 am
Posts: 3017
Location: Redding, CA
The 5V4 has a cathode whereas a 5Y3 does not. The 5Y3 will probably work but may introduce objectionable hum. The type 83V (not 83 without "V") is equivalent but that is going backwards!

Norman

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 Post subject: Re: Sub for 5V4?
PostPosted: Feb Sun 18, 2018 6:44 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 26975
Location: Detroit, MI USA
Depends on what it's used in, and what the B+ current demands are.

5Y3 will work fine for a 5V4 within the lower current limits of the 5Y3 in many applications.

The lack of a cathode on the 5Y3 means B+ voltage will come up quite high within a second or two of applying power, which was not the case with the 5V4 that took 20 seconds or so to warm up. It's very important that the electrolytic caps in the unit have a high enough voltage rating so that temporarily higher voltage does not cause them to explode. But that higher voltage is only for the length of time it takes the other tubes in the set to warm up and start putting a load on the B+.

Cathode type rectifier tubes like the 5V4 have a little higher B+ output than filament types do under load, so your B+ under load may be about 20 to 40 volts less than it would have been with a 5V4.

Since 5V4's are neither scarce nor expensive you'd be better off eventually sourcing the correct tube but you may be able to sub a 5Y3 temporarily.

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Dennis

Experience is what you gain when the results aren't what you were expecting.


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 Post subject: Re: Sub for 5V4?
PostPosted: Feb Sun 18, 2018 9:17 pm 
Member

Joined: Jan Wed 11, 2012 4:21 pm
Posts: 717
Location: Elko, MN.55020
Thanks for the replies.
I think I will try to find the correct tube and put that in.
I will feel better knowing that the correct tube is in place.
If anyone has a good spare, let me know.
Thanks again,
murf


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 Post subject: Re: Sub for 5V4?
PostPosted: Feb Sun 25, 2018 2:53 pm 
Member

Joined: Jan Wed 11, 2012 4:21 pm
Posts: 717
Location: Elko, MN.55020
Tube found.
Thanks guys,
murf


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