[Makiah S]

https://www.amazon.com/CAIG-LABORAT...=2025&creative=165953&creativeASIN=B0000YH6F8

Cheaper

Thanks! I actually got my pair from Amazon as well just to try it, wasn't pushing the link so much the product. But I'm glad you found a more cost effective avenue

 

[brad1138]

Hello, I am trying to figure where these (pic #1) fit in the list. According to this page http://www.vacuumtubes.com/6sn7.html the GT is the same as VT-231 "type 1" and that fits with some of the comments in the OP of this thread. But these have flat plates, like "type 2" VT-231, and both of these guides refer to a rectangular plate for the "type 1".

I am not sure what I have actually fits any of the descriptions, it seams the flat plates aren't referenced by anyone until the VT-231 with extra support rods came out (pic #2).

When people talk of the Raytheon VT-231 flat plate being a very good tube, do they mean these or, just the later variant with support rods (pic #2)


***EDIT***: The more searching I do, it seems the VT-231 version of this is all but nonexistent. I do not believe this model is what is meant when people say "VT-231 flat plate"

 

[larcenasb]

Since many have talked about 6F8G tubes here, I hope it's okay my posting in this thread.

I've just acquired a couple beautiful Ken-Rad 6F8G round plate tubes, and am wanting to learn how to interpret their date codes.

The tube to the left marked "Ken-Rad" and "VT-99" has a date code of "P2R," and the tube to the right marked "WARDS SUPER AIRLINE" has a date code of "E9R."

Their constructions are identical except that the WARDS has copper tabs holding the plates (see color difference between the tubes). Possibly, I'd guess, that the copper version is of earlier manufacture--but I'm not sure and would really like to know for a fact. So, if anyone has a data sheet for Ken-Rad date codes, or can tell me how to interpret them, I'd be deeply appreciative. Thanks so much and happy listening!

 

[spacequeen7]

There is few B65 up for grabs on ebay ..little pricey
https://www.ebay.com/itm/B65-6SN7GT...893423?hash=item2cc774faef:g:CBcAAOSwvThZ1NyF

 

[brad1138]

..little pricey

Just a little..... LOL!

 

[abvolt]

funny wonder if they'll sell..

 

[attmci]

funny wonder if they'll sell..

They won't.

But I was surprised another guy had sold a number of these for such a high price.

https://www.ebay.com/itm/RCA-VT-231-6SN7-GT-WELL-BALANCED-PAIR-Gm-Ip-NOS-PLATINUM-MATCHED-TUBE/140675286711?_trkparms=aid=555018&algo=PL.SIM&ao=2&asc=44039&meid=07785eaddca44218bcbe2624c8428f30&pid=100005&rk=1&rkt=6&sd=253108327259&itm=140675286711&_trksid=p2047675.c100005.m1851

 

[sasaki99]

Can somebody explain me the expression of "Fry transformer" and "send your transformer up in smoke"
What is transformer in Audio.
Thanks

 

[Frihed89]

Power transformers convert AC voltage from your mains up or down to another AC voltage, and block DC votage; Input and output transformers are used for impedance matching from the input signal to the driver or from the power tube to speaker. Interstage transformers either transform the impedance of a signal between two tube stages, or when they needed to convert between single-ended and differential signals.

"Fry" means you overload the transformer on the input side with too much voltage, usually the power tranformer.

 

[ilikepooters]

Not had time to read the whole thread,

Any opinions on the metal base versions of the Russian 6N8S tubes? (Also known as 1578, or, MELZ etc)

They seem to command premium prices from what i see, i want to know if it's just because of rarity or if there's really any sonic value to this pricing.

 

[MWSVette]

Not had time to read the whole thread,

Any opinions on the metal base versions of the Russian 6N8S tubes? (Also known as 1578, or, MELZ etc)

They seem to command premium prices from what i see, i want to know if it's just because of rarity or if there's really any sonic value to this pricing.

The "Search this thread" field above is your friend. Search 1578 you will get a number of impressions...

 

[sasaki99]

Power transformers convert AC voltage from your mains up or down to another AC voltage, and block DC votage; Input and output transformers are used for impedance matching from the input signal to the driver or from the power tube to speaker. Interstage transformers either transform the impedance of a signal between two tube stages, or when they needed to convert between single-ended and differential signals.

"Fry" means you overload the transformer on the input side with too much voltage, usually the power tranformer.

Thank you sir, I may not understand all these stuff. My question is will these transformers damage my amp or my headphone sir?

 

[MWSVette]

Thank you sir, I may not understand all these stuff. My question is will these transformers damage my amp or my headphone sir?

The transformers are on the right of the amp in this picture. If you use the wrong tubes or power voltages (115v vs 230) you can burn out or "fry" those transformers resulting in a non-functional amp...

 

[attmci]

Not had time to read the whole thread,

Any opinions on the metal base versions of the Russian 6N8S tubes? (Also known as 1578, or, MELZ etc)

They seem to command premium prices from what i see, i want to know if it's just because of rarity or if there's really any sonic value to this pricing.

Most metal base versions of the Russian 6N8S tubes are not the famous 1578.

 

[attmci]

Thank you sir, I may not understand all these stuff. My question is will these transformers damage my amp or my headphone sir?

I don't think your message has anything to do with this thread.

And yes, when the transformers are damaged, your amp is done.