[Slade01]

Yah, I was more interested if the cracked base was an issue or not. Besides, my Vali2 is kind of meh with 6sn7s so the only reason I'd get one of those Melz is the cool glowy holes in the plates.
And to top things off I need to get earpads for 2 of my headphones, I can't afford to buy tubes (why the hell does foam and pleather cost so damn much?)

I have a melz with a cracked metal base, but it was not an issue at all with the tube I have. It plays fine, sounds great, no issues.

 

[maketus]

if i replace 6sn7 1k cathode resistor, some 300ohm,, is 0.25-1w enough

 

[bcowen]

if i replace 6sn7 1k cathode resistor, some 300ohm,, is 0.25-1w enough

I would use a 1/2 watt or higher. Why are you changing the resistance value?

 

[JKDJedi]

The date code and some other things tell me it’s a National Union. WP could mean it’s a later tube from 1959.

My vote is NU, it has WP stamped on it? (the NU I have that looks like that one is 4/57 on the box and 247 309 stamped on the tube)

 

[JKDJedi]

Looking at the above link and I found this tube…
https://www.ebay.com/itm/165109735529

I know a cracked base is (mostly) harmless on a 6SN7, hows about these metal base ones

dam..someone got a good deal on that one. Cracked base adds a little something to it too. I was gonna say the base is just cosmetic but then remembered about the heat these guys generate. Been a long time.. One of my amps has tubes I set in it three or four months ago! What should I burn my fingers to tonight... ahh maybe tomorrow..

 

[Deceneu808]

They are indeed the proper plates and meet all the criteria for a very good Melz tube including the date of manufacture.

Ordered one and a pair of '52 Fotons

 

[maketus]

would use a 1/2 watt or higher. Why are you changing the resistance value?

I read another site, allows for a much more steady biasing voltage?

 

[Paladin79]

Ordered one and a pair of '52 Fotons

Very nice, oftentimes those are the brands and types I would include with amps I designed unless the recipient already had a large collection of 6sn7's.

 

[jonathan c]

Ordered one and a pair of '52 Fotons

There is a pair of Fotons that is not owned by @bcowen?…

 

[Deceneu808]

There is a pair of Fotons that is not owned by @bcowen?…

If you shop in EU time yes. You can find some

 

[Deceneu808]

Spilling the beans. I even found a '51 Foton for sale

https://www.ebay.com/usr/1985max22012?_trksid=p2047675.l2559

 

[Paladin79]

Spilling the beans. I even found a '51 Foton for sale

https://www.ebay.com/usr/1985max22012?_trksid=p2047675.l2559

He has an interesting assortment of Melz as well and I have not had issues with any of my purchases from that seller.

 

[sam6550a]

I read another site, allows for a much more steady biasing voltage?

It will definitely change the bias voltage, but I would not change circuit values because you read it on the internet. You really need to understand the circuit before you start changing things, or bad things may happen.

 

[Paladin79]

It will definitely change the bias voltage, but I would not change circuit values because you read it on the internet. You really need to understand the circuit before you start changing things, or bad things may happen.

I was trying to think of a nice way to say the very same thing, well done Sam!

Finnegan and I are helping a neighbor with some coaxial cables, he likes to be a part of most anything in my shop. Right now he is inside a Canare tool case trying to keep the connectors warm.

 

[sam6550a]

I was trying to think of a nice way to say the very same thing, well done Sam!

Finnegan and I are helping a neighbor with some coaxial cables, he likes to be a part of most anything in my shop. Right now he is inside a Canare tool case trying to keep the connectors warm.

Thanks for the compliment, Tom! I want to assure that no persons, tubes, amplifiers, or felines are harmed in pursuit of this hobby.