I have been a member for 5or 6 years .look at my content

can find no way to post an add

One is marked 5692 GE . Two has no marks. Both are RCA build red base. 10,000 tubes and test great. thanks rick

Two GEC L63 and adapter equal a 6sn7gt. Talk about you channel separation. I have don this , it sounds wonderful. I can do two sets , thats 4 tubes and adapters for 300 and shipping

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tested on A Hickok TV/7 U where 38 is low . 88 and 88 84 and 84 93 and 94 84 and 86 these look NOS 50$ and shipping Cheers Rick

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You may have heard this dac at the Denver show. It belonged to Loather america , First watt rep. Has the up graded power supply and USB2 sounds vary organic . thanks Rick 708 645 1237 I put this here by mistake

I have a pair of bugle boys 6dj8's . test almost new. 45 shipped thanks Rick

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  Tested on a Hickok TV7/U .Where 50 is low. 80 and 81 date code 51/39 99 and 95  date cade 51/39 55$ shipped in the usa . 61$ shipped in the world thanks Rick

I'm not saying the guy up there is all wrong about why the tubes were blacked out. But world war II was over too. thanks 

Has any one done the Listening tests between a smoke glass VT231 KEN RAD and a clear glass VT231 KEN-RAD ? They should sound the same. The black cote was there so the germans could not see the lit up radio tubes. thanks Rick

I agree about the 5692. I have not done my home work on the 5691. thanks rick

hello; a 5691 is a 6SL7  and a 5692 is a 6sn7 . Different tubes and 6sn7 are worth more . I have both. thanks rick