[Wes S]

. . .

 

[Motocrossman24]

RCA VT-231

Holy amp stack and tube choices Batman...that grey glass does look nice in there

 

[bcowen]

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[eagerears]

This isn't really Lyr-specific, but I figure people here might know: I bought an old 6SN7/VT-231 made in 1945. It sounds really good in the Lyr, but occasionally, the left channel gets fairly quiet (doesn't cut out entirely) for a few seconds and then comes back. Is this a sign of age? I'm not hearing any buzzing or other noise from it. Anything that can be done about it?

(I'm pretty sure I've narrowed it down to the tube being at fault here, I haven't heard that with the other tubes in the same setup.)

 

[Motocrossman24]

Is this definately a sylvania 6sn7wgt? It was advertised as such, but all markings are worn off besides made in USA and “607” on the base which I’m assuming is a date code? It definately has the sylvania style plates.

 

[Motocrossman24]

 

[bcowen]

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[JohnBal]

Is this definately a sylvania 6sn7wgt? It was advertised as such, but all markings are worn off besides made in USA and “607” on the base which I’m assuming is a date code? It definately has the sylvania style plates.

I would say it is. The etched markings look real enough and the numbers could be a date code indicating the seventh week of 1956. But I'm no expert...

 

[quimbo]

New to tubes, found this forum https://www.head-fi.org/threads/the-reference-6sn7-thread.117677/

 

[eagerears]

"Old" as in having been used for a long time, or old just because of when it was manufactured? Any idea (roughly) how many operating hours it has or how long it's been in use? I've never personally experienced what you're describing, but it sounds like signs of failing emission -- the tube is just worn out. One triode is still going, but the other is gasping its last breath.

Old as in "around for a long time" – it's not necessarily NOS, but looks unused and apparently tests very well. But either way, it's probably not the tube that's at fault, I've now heard the same thing happen with a different tube. So I'm wondering of the Lyr has an issue. Testing right now with the LISST, my suspicion is that one of the heaters is cutting out intermittently.

 

[Motocrossman24]

That sylvania wgt that I posted above is my new favorite tube in the lyr3. It has a midrange and treble that just sounds so alive in this amp.

 

[Wildcatsare1]

A brief update the Foton, 1962’s have nice tone, but are a bit forward and don’t extend as deep in the bass as either the Sylvanias, the ‘52, or the ‘48 VT-231, which remain my favorite tubes.

 

[bcowen]

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[Wildcatsare1]

Got any pics by chance? Or have you posted some already?

I don’t yet, the 52 is a rebranded Sylvania, in Philco garb, I’ll post some latter today.

I’m having surgery Friday morning, so I’ll be out of pocket for a bit, so I may not get the pics until next week.

 

[bcowen]

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