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Eimac YU-191B

 

?I have seen some inexpensive sorce? ebay£¨$220/ea), it? is seems a water cooled version of 3CX3000A7 but more power(driving power 535W and 8350W out put)
? ? ? Hsu
 

While working at Eimac San Carlos I wasn't involved with the Salt Lake City products but I have product announcements for both sites.
"Oct 1989. The YU-191B was a version of the YU106 a water cooled 3CX3000A7, with a special water jacket for Ehrhorn"

A YU-191B should perform exactly the same as a 3000A7 except needing a flow of water thru the anode cooler to keep it from melting down.?
Reid? W6MTF
 

The YU-106 appears to be a just 3-4 wraps of 3/8"? copper tubing wrapped around the anode.?
The YU-191B? is the real deal, with the coffee can around the anode.... just like all the other water cooled tubes.??

2-3 years ago, several appeared on the used market..... and several? hb HF amps were built using them.? ?I forget what the required water flow rates were.? The folks were using distilled water, external pump, external air cooled radiator ( shrouded between fan and radiator), and once they got the cooling optimized, the amps worked very well.??

?

The beauty was...... there was no noise, nor heat in the shack.? Some of the folks had the hot air from the? radiator exhaust? routed to the outside in hot wx.? ?And routed to the inside in winter.? ?As long as no leaks anywhere, and safety interlocks used, it works fine.? ?IE: with loss of water flow, reduced water flow, water too hot entering the tube, everything shuts down asap, including opening off key line, and shutting the fil off.

?

Note forced air is still required to cool the fil.? 7.5 vac @ 50 amps =? 375 watts.?

?

It's a superb tube....and afaik, it's still rebuildable per Econco. .?
 

¿ªÔÆÌåÓý

Jim,

?

It¡¯s like having an Alpha Stanley Steamer on the bench.

?

Gurgle, gurgle.

?

Hal Mandel

W4HBM

?

From: [email protected] <[email protected]> On Behalf Of Jim VE7RF
Sent: Wednesday, August 16, 2023 12:16 PM
To: [email protected]
Subject: Re: [ham-amplifiers] Eimac YU-191B

?

The YU-106 appears to be a just 3-4 wraps of 3/8"? copper tubing wrapped around the anode.?
The YU-191B? is the real deal, with the coffee can around the anode.... just like all the other water cooled tubes.??

2-3 years ago, several appeared on the used market..... and several? hb HF amps were built using them.? ?I forget what the required water flow rates were.? The folks were using distilled water, external pump, external air cooled radiator ( shrouded between fan and radiator), and once they got the cooling optimized, the amps worked very well.??

?

The beauty was...... there was no noise, nor heat in the shack.? Some of the folks had the hot air from the? radiator exhaust? routed to the outside in hot wx.? ?And routed to the inside in winter.? ?As long as no leaks anywhere, and safety interlocks used, it works fine.? ?IE: with loss of water flow, reduced water flow, water too hot entering the tube, everything shuts down asap, including opening off key line, and shutting the fil off.

?

Note forced air is still required to cool the fil.? 7.5 vac @ 50 amps =? 375 watts.?

?

It's a superb tube....and afaik, it's still rebuildable per Econco. .?
 

Not quite.? ?It's a water cooled tube, not vapour phase cooled.? ?Air cooling is good for 50 watts per sq CM of internal anode area.? ?Vapour phase cooling is good for 135 watts of internal anode area. Water cooling is good for 1000 watts of internal anode area.?

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