[Ripper2860]

Yeah, I couldn't really tell if there was one or two getter holders on top. The shielding and flashing get in the way of a clear view.

 

[therremans]

Are most of these 6520s labeled as Chatham 6AS7G and one must know the construction? Or was 6520 printed on a majority of the tube bases. Also did Tung sol make any of the 6520?

 

[CaptainFantastic]

Are most of these 6520s labeled as Chatham 6AS7G and one must know the construction? Or was 6520 printed on a majority of the tube bases. Also did Tung sol make any of the 6520?

My two 6520s are labelled as such.

Tube 1:



Tube 2:

 

[Velozity]

I don't think you can tell the difference between a 6520 and a 6AS7G by looking at construction. 6520 is essentially a 6AS7G with better specs and tighter tolerances. Just look at the spec sheets. 6520 gm is a range of 6.4 mA/V - 7.8 mA/V. 6AS7G gm is a range of 5.8 mA/V - 8.2 mA/V. Mu on the 6520 is a range of 1.9 - 2.5. Mu on the 6AS7G is 1.4 - 2.6. Max plate voltage on the 6520 is 300V. Max on the 6AS7G is 275V. From the Tung-Sol datasheet, the difference is:

I would say there are no visual differences between these two tubes (manufactured at the same time, same place). Of course there are various builds of each, but that doesn't mean one is the other. If it says 6520 on the base then it's a 6520. This is a little more tricky with the 6520 domino plate version, but that is related to the 5998, not the 6AS7G (two totally different tubes).

 

[Ripper2860]

I've seen one 6520 with the 6AS7G style plates and upon visual inspection could not really tell a difference between them. They seem to be far more rare than the domino plated tubes labeled 6520.

 

[BackwardPawn]

Chatham / Tung-Sol had at least 2 variations of the 6AS7G, as far as I know...

1) Top getter / flashing version with the chrome trim at the top and bottom of the plates, a top single D getter (from what I can see), and steel posts. (Right)

2) Bottom getter/flashing version with double D getter holders and copper posts. No chrome trim on top and bottom of the plates. (Left)

Just curious, is there any difference in sound between the top and bottom getter style? I just confirmed an order on two bottom getter tubes. The seller implied the difference had to do with biasing.

 

[bcowen]

this any good?

I'll say this on solder suckers: I've tried probably a half dozen of them over the years, and none of them worked worth a crap. I mean even a remote crap. Then I bought and tried the Soldapullt after @Paladin79 recommended it, and it works like a charm. Short of a multi-hundred dollar desoldering vacuum station, the Soldapullt is *it* and it works very well at this particular task (sucking tube pins). So if you're looking at something else, my input is simply this: don't. The Soldapullt is also available on Amazon with free shipping if you have Prime. And as @Paladin79 already warned, beware of cheap Chinese knock-offs (also available on Amazon). The one linked below is the real deal.

https://www.amazon.com/gp/product/B006GOKVKI/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

 

[bcowen]

I ran my own business for years so I still have Weller soldering stations new in the box if one of mine ever fails. I tend to use Kester .020 silver bearing solder for use inside pins, the small diameter is great. SN62,PB36,AG02 SN being tin (stannum), PB being lead (plumbum), AG being silver (argentum).

Silver cuts down on corrosion.

Also available on Amazon, and this diameter works quite nicely for tube pins:

https://www.amazon.com/gp/product/B004DEUYBY/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

Apologies for coming across like an Amazon fanboy. I'm really not and certainly not trying to promote them...I'm just a free shipping addict.

 

[BackwardPawn]

Apologies for coming across like an Amazon fanboy. I'm really not and certainly not trying to promote them...I'm just a free shipping addict.

Unless you can find something local (and then have to brave the pandemic), its the only way to receive it in two days or less.

 

[therremans]

Also available on Amazon, and this diameter works quite nicely for tube pins:

https://www.amazon.com/gp/product/B004DEUYBY/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

Apologies for coming across like an Amazon fanboy. I'm really not and certainly not trying to promote them...I'm just a free shipping addict.

Well I just bought both haha.

 

[Ripper2860]

Just curious, is there any difference in sound between the top and bottom getter style? I just confirmed an order on two bottom getter tubes. The seller implied the difference had to do with biasing.

My preference is the bottom getter version. Seems a bit warmer with a bit more impact on the bottom-end. Don't get me wrong, both are nice sounding tubes.

 

[bcowen]

Unless you can find something local (and then have to brave the pandemic), its the only way to receive it in two days or less.

That also requires getting dressed. I can stay in my PJ's while shopping at Amazon. LOL!!

 

[BackwardPawn]

That also requires getting dressed. I can stay in my PJ's while shopping at Amazon. LOL!!

The bad thing is when you log into a meeting and then remember you're still in PJs

 

[JKDJedi]

My preference is the bottom getter version. Seems a bit warmer with a bit more impact on the bottom-end. Don't get me wrong, both are nice sounding tubes.

Nah you were right from the beginning.. bottom or nada..

 

[JKDJedi]

Are most of these 6520s labeled as Chatham 6AS7G and one must know the construction? Or was 6520 printed on a majority of the tube bases. Also did Tung sol make any of the 6520?

I had an ideal that it was an exclusive contract to Tung Sol to make the 6520.. any other 6520's out there are rebranded Tung Sols.. (my assumption, and you know what that does.. )