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Author Topic: 200 S Update  (Read 4366 times)

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Offline F6Forry

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200 S Update
« on: April 08, 2009, 11:24:21 am »
You may recall my questions on the 1970 200s head blowing a fuze. A friend with radio-tv experience looked at it. We pulled the chassis and noticed the head had fallen on the power corner and the repair was a little sloppy. We straightened that mess out and pulled the tubes as suggested. Powered up and didn't blow the fuze, added the tubes and all was good except for a blown 12AX7. Jim noticed the power cap felt hot so I ordered a J&J replacement cap from Eurotubes. We finally got around to installing that along with a Raytheon 12AX7 that tested the best of my spares and it also needed a 6AN8 which I procurred. To make a long story short-IT LIVES and sounds AWSOME with my 68' EB2C!! Thanks to all for the encouragement. I have some internal before and after pics if anyone's interested. Forrest
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Offline loudthud

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Re: 200 S Update
« Reply #1 on: April 08, 2009, 08:18:36 pm »
What J&J cap did you use?
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Offline F6Forry

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Re: 200 S Update
« Reply #2 on: April 09, 2009, 06:46:06 am »
Their 20-20-20-40-500v. We had to enlarge the mounting hole in the chassis to prevent grounding. Other than that,everything was easy.
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Offline Isaac

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Re: 200 S Update
« Reply #3 on: April 09, 2009, 06:27:49 pm »
Congratulations!
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Isaac

Offline Johnny

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Re: 200 S Update
« Reply #4 on: April 11, 2009, 06:02:28 am »
Quote from: F6Forry on April 09, 2009, 06:46:06 am
Their 20-20-20-40-500v.

Did he happen to check the voltages that are going through that cap? I just did the same thing to mine but ended up using 600v individual caps as the voltage was well over 500, I am sure it was at least 540, maybe even 560 on the B+ with 120v AC at the plug.
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Offline F6Forry

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Re: 200 S Update
« Reply #5 on: April 11, 2009, 02:13:50 pm »
No, he worked from the schematics, and we went with what Euro Tubes recommended.
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Offline Soundmasterg

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Re: 200 S Update
« Reply #6 on: April 15, 2009, 02:41:04 am »
Quote from: Johnny on April 11, 2009, 06:02:28 am
Quote from: F6Forry on April 09, 2009, 06:46:06 am
Their 20-20-20-40-500v.

Did he happen to check the voltages that are going through that cap? I just did the same thing to mine but ended up using 600v individual caps as the voltage was well over 500, I am sure it was at least 540, maybe even 560 on the B+ with 120v AC at the plug.


Thats why I recommend individual caps, but if you go with series connected 350v caps, you get a 700v rating, and it ends up being cheaper than the Sprague 600v caps. Do a search and the info is there from a couple years ago.

Greg
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Offline Johnny

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Re: 200 S Update
« Reply #7 on: April 17, 2009, 08:44:11 am »
There are 600v caps available that are not Sprague, and not pricey either.
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