[Slade01]

https://www.ebay.com/itm/RARE-TALL-...090296?hash=item2b000793b8:g:XF0AAOSweFlgOSoL

Anyone here ever see/try tubes like this one...a tall bottle with side mouse ears? This is the only 2nd one i've seen of this kind. I'm just curious...

 

[bcowen]

https://www.ebay.com/itm/RARE-TALL-...090296?hash=item2b000793b8:g:XF0AAOSweFlgOSoL

Anyone here ever see/try tubes like this one...a tall bottle with side mouse ears? This is the only 2nd one i've seen of this kind. I'm just curious...

I've never seen one like that. Interesting. It'd have to sound better than a (normal) Mouse Ear to be worth $125 though (IMO).

 

[mayurs]

My raytheon Vt-231 sound fabulous but has a slight hum on my Euforia. Is there a way to get rid of it?

 

[Marutks]

My raytheon Vt-231 sound fabulous but has a slight hum on my Euforia. Is there a way to get rid of it?

Is there no hum if you use other tubes? Can you recommend some quiet 6SN7 tubes?

 

[JTbbb]

Is there no hum if you use other tubes? Can you recommend some quiet 6SN7 tubes?

The RCA red base 5692’s have a reputation for being silent. Mine certainly are, and sound good too.

 

[scottshields]

The RCA red base 5692’s have a reputation for being silent. Mine certainly are, and sound good too.

+1 on the 5692's. I have these from Upscale Audio and they are whisper quite (and sound great). I've also noticed a very slight hum if the volume knob is at zero but if turned up just a little (with no music) the hum disappears with these.

I just took delivery today of Sylvania 6SN7GTA chrome domes from Brent Jessie who's a great tube source BTW. They seem to have a very slight hum. Way to early to fully judge them but I have high hopes for them. They were also only $90 for the pair.

 

[SHIMACM]

Guys, my Brimar 6sn7 tube has a time that has noise, or even a channel fails, but when I tap it a little, it goes back to normal and plays normally without any noise. What can this be?

 

[JTbbb]

Guys, my Brimar 6sn7 tube has a time that has noise, or even a channel fails, but when I tap it a little, it goes back to normal and plays normally without any noise. What can this be?

I think the advice will be to re-solder the pins. To start with anyways.

 

[bcowen]

Guys, my Brimar 6sn7 tube has a time that has noise, or even a channel fails, but when I tap it a little, it goes back to normal and plays normally without any noise. What can this be?

What @JTbbb said.

 

[mayurs]

I think the advice will be to re-solder the pins. To start with anyways.

How does one go about doing this? Sorry if its noob question as I have never soldered before.

 

[SHIMACM]

I think the advice will be to re-solder the pins. To start with anyways.

Besides the pins, is there a possibility of some other problem?

 

[Ripper2860]

+1 on reflowing solder or re-soldering.

I've also resolved intermittent noise issues by taking a tube and either thumping the top of the tube a few times or even taking the tube in my hand and tapping it on a desk surface while holding the tube upside down. Sometime these noise issues are the result of debris collecting on the plates and a reasonably vigorous yet cautious few taps will cause the debris to loosen and fall.

 

[Marutks]

The RCA red base 5692’s have a reputation for being silent. Mine certainly are, and sound good too.

I have got CBS HYTRON 5692 tube. It has yellowish-brown base.

Is RCA red base tube better than this tube?

 

[bcowen]

I have got CBS HYTRON 5692 tube. It has yellowish-brown base.




Is RCA red base tube better than this tube?

We were just discussing these in another thread. It's unclear who the manufacturers of these tubes were, but according to Upscale Audio (which is by no means definitive, but usually has reliable information) they were made by RCA, GE, and CBS/Hytron. I just happen to have one of each here that are paying a visit from a fellow HeadFi'er, and as best I can tell these 3 tubes are totally identical inside. Same support rods, same plate design (and even color), same large rectangular getter, and although the coloration of the micas varies between them, they are all true mica material and all shaped exactly the same with identical support rod collars and cutout design. If these were not all made in the same factory, and if those 3 companies were truly the only ones involved, they were extremely adept at copying each other down to the finest detail.

So does the RCA sound better? I'd be surprised if it sounded much different at all, honestly. But I'll leave the sonic comparison to the owner of the tubes once I send them back. Fortunately they all test very close to each other in GM, so any differences (if there are any) won't be due to different output levels.

https://upscaleaudio.com/products/cbs-hytron-5692

 

[attmci]

Someone please buy these very very rare nice 6sn7w before I pull the trigger.

https://www.ebay.com/itm/265084923780?ul_noapp=true