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Old 3rd November 2006, 08:31 PM   #11
kevinkr is offline kevinkr  United States
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Some parts of the USA are quite hot as well, and even where I live in the summer the temperature outdoors exceeds 32 C quite regularly, and gets to 40 C sometimes. We have no AC so I avoid using even the 300B amplifier when it is very hot, which because of its tube regulated supplies throws off quite a lot of heat.

It's cold outside now, but my basement listening room is always warm until outside is below 0 C..

Good to hear about the copper plate version, I have seen them being sold on eBay by reputable sellers (one or two I have dealt with before) so I think I will try a pair sometime soon.

How much power do you think you are getting, what is plate current and voltage for example?
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Old 3rd November 2006, 08:53 PM   #12
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Unhappy Oops!

Sorry all. I am suffering from mentalpause. I somehow thought the GM70 was a euro version of the 813. My mistake. I`d love to pick up some GM70`s but the GM dealers over here in Canada just sell mostly unecessary garbage which the planet could live just fine without if they completely stopped today.

BTW, anyone got a single RCA 813 they can spare? I`ve been wanting to build a SE amp and I finally found my pair that were misplaced for ten full years and to my dismay one has an open filament. I`d go to my closest RCA dealer but alas the RCA dealers over here in Canada just sell mostly unecessary garbage (Thompson CSF) which the planet could live just fine without if they completely stopped today.
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Old 3rd November 2006, 09:08 PM   #13
Tweeker is offline Tweeker  United States
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Ive heard graphite plate GM70 sounds much better (than cold GM70 graphite tube) when run hot, use full 125 watts dissipation.

Graphite plates can and should be run to a dull red glow (which you may not see over this tubes light bulb like heater) in order to getter.
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Old 3rd November 2006, 09:17 PM   #14
Tweeker is offline Tweeker  United States
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GU13 is the Russian 813 equivalent.

GSTube is offering them, I have no experience with this vendor.
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Old 4th November 2006, 12:39 AM   #15
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Hi...all
You figue right!!! the hotter the better for this lantern! ,i think the sweetest spot for ma the V.plate around 800 volt. the current approx. 110 M.A the sound just right.,for investment and sound quality i love the copper plate,but be awared of the plate dissipation is lower than the graphite.
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Old 4th November 2006, 12:53 AM   #16
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Am going to leave this forum a few days,today am going to BANGKOK,anyhow i'll check it regulary,i post a pic of GM70 copper plate singing a song of Diana Ross the sound very smoothhhhh!!!
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