Author Topic: Where to order 5y3gt tube locally?  (Read 7542 times)

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Offline royc

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Re: Where to order 5y3gt tube locally?
« Reply #30 on: Dec 11, 2015 at 08:11 PM »
Thanks!!
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Offline royc

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Re: Where to order 5y3gt tube locally?
« Reply #31 on: Dec 12, 2015 at 06:02 PM »

yes... if less than 50 ohms per side, then we need to add more resistance,
if more than 50 ohms then no need to add resistors...

i have a soft spot for diy'ers....i help them when i can....

275 ohms for pin 4 and 306 ohms for pin 6
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Offline tony

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Re: Where to order 5y3gt tube locally?
« Reply #32 on: Dec 12, 2015 at 06:05 PM »
275 ohms for pin 4 and 306 ohms for pin 6

that is fine, no need to do anything further, just lower the filter cap from 47uf to about less than 20ufd.
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline royc

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Where to order 5y3gt tube locally?
« Reply #33 on: Dec 12, 2015 at 06:35 PM »
that is fine, no need to do anything further, just lower the filter cap from 47uf to about less than 20ufd.

Sorry after checking the resistance I traced the connection again and noticed just now that the cap's - is connected to the + of another 47uF. It took a while for me to realize that there are 2 x 47uF caps in series so that is around 20uF and is within the typical value. I confirmed with the builder and he remembered doing that (it was around May when he started building it). That means the cap value is acceptable right? Probably just a case of bad tube?
« Last Edit: Dec 12, 2015 at 06:36 PM by royc »
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Offline tony

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Re: Where to order 5y3gt tube locally?
« Reply #34 on: Dec 13, 2015 at 06:42 AM »
Sorry after checking the resistance I traced the connection again and noticed just now that the cap's - is connected to the + of another 47uF. It took a while for me to realize that there are 2 x 47uF caps in series so that is around 20uF and is within the typical value. I confirmed with the builder and he remembered doing that (it was around May when he started building it). That means the cap value is acceptable right? Probably just a case of bad tube?

yes a bad tube, just plug in a new one...
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline royc

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Where to order 5y3gt tube locally?
« Reply #35 on: Dec 13, 2015 at 07:23 AM »
Thank you sir. I only noticed it while looking for the ground to get the resistance. I was expecting all three caps to be connected to ground and that is where my probe would touch. I was surprised that the cap was not connected to ground, even assumed that he did not follow the diagram. I then wondered why there are four big caps instead of three. I even had to google to understand what I saw :D
« Last Edit: Dec 13, 2015 at 07:43 AM by royc »
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Offline tony

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Re: Where to order 5y3gt tube locally?
« Reply #36 on: Dec 13, 2015 at 07:51 AM »
not at all bad, the cost of a new tube is peanuts compared to the knowledge gained...
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline royc

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Where to order 5y3gt tube locally?
« Reply #37 on: Dec 13, 2015 at 10:22 AM »
You're right. I gained additional knowledge with this experience:-)
« Last Edit: Dec 13, 2015 at 10:22 AM by royc »
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