[Galapac]

Extremely sad. I've not blown a headphone before.



That's a low reading and not one I'd buy. So beware if it pops up for sale again.


I'm getting these Bendix 6080wb as a 2nd pair.

Bendix are always good in my book. Nice pair of slotted.

 

[Galapac]

Agreed, and my misery was because I used headphone out as preamp.

Are you going to contact Hifiman to see if you can get them repaired. They cost over 1K right?

 

[Bruc3]

I am thinking to buy a pair of Tung Sol 5998.

For those who have had both, what are your impressions of the differences between the Mullard 6080 and TS 5998?

 

[hp4fun]

Person that bought those was a reseller. Look at the feedback.
dan198745 (34655)

I took a pass on those as they weren't matched and the specs on one were below my minimum.

Valve 1) Ia 74/90 - Gm 5.4/5.9

Valve 2) Ia 51/88 - Gm 4.5/5.6

How low is low? Different sellers have different metrics.

 

[UntilThen]

I am thinking to buy a pair of Tung Sol 5998.

For those who have had both, what are your impressions of the differences between the Mullard 6080 and TS 5998?

Tung Sol 5998 is more powerful and more vibrant. It's like an energised 6080. Bass is pretty solid. That said I find the Mullard 6080 having a very good sweet, warm tone. It's very clear too. The other extreme of the RCA 6as7g.

IMO the TS 5998 is definitely better than Mullard 6080 and the opinion of many others too, otherwise the price won't be creeping up so high. I have a spare pair but I need to test to see if it plays well. If it is, I'll sell it to you Bruce. One tube of the spare pair was bought NOS from Langrex.

 

[hp4fun]

Are you going to contact Hifiman to see if you can get them repaired. They cost over 1K right?

Should be fine. Just a surprised experience.

Tung Sol 5998 is more powerful and more vibrant. It's like an energised 6080. Bass is pretty solid. That said I find the Mullard 6080 having a very good sweet, warm tone. It's very clear too. The other extreme of the RCA 6as7g.

IMO the TS 5998 is definitely better than Mullard 6080 and the opinion of many others too, otherwise the price won't be creeping up so high. I have a spare pair but I need to test to see if it plays well. If it is, I'll sell it to you Bruce. One tube of the spare pair was bought NOS from Langrex.

Cannot agree more. Maybe GEC 6080 is like a glorified Mullard 6080 that has a the same sweet warm tone but more solid bass.

I use 90% of the TS 5998 and 10% Mullard when I want a bit more sweet vocal. Now I do not use both, but if I have to sell one, I will sell Mullard.

Get a 5998 and AFAIK no one has buyer remorse so far.

 

[UntilThen]

Get a 5998 and AFAIK no one has buyer remorse so far.

Only when you get a bad pair and there are some out there.

 

[Bruc3]

I have a spare pair but I need to test to see if it plays well. If it is, I'll sell it to you Bruce. One tube of the spare pair was bought NOS from Langrex.

Oh thought you only had 1 pair with the green label, didn’t know you had a spare pair.

 

[UntilThen]

My spare pair are the 2 on the right.

 

[Galapac]

Well since we are showing off our 5998’s here is my family.

 

[hp4fun]

How low is low? Different sellers have different metrics.

M

Extremely sad. I've not blown a headphone before.



That's a low reading and not one I'd buy. So beware if it pops up for sale again.


I'm getting these Bendix 6080wb as a 2nd pair.

I want to understand this before my future purchases.

This one says NOS
https://www.nosaudiotubes.com/produ...in-england-head-phone-amplifier-tube-3104001/

And the readings are
Sr.No.3104001 T1 Ia=49.2ma Gm=4230 T2 Ia=51.8ma Gm=4160

How is this compared to the above reading, e.g.,
Ia 51/88 - Gm 4.5/5.6

Thanks.

 

[UntilThen]

I do not study tube data but my pair of GEC 6as7g is almost perfect.
MOV A1834 Pair Brown Curved Bases Cup Getters (1).pdf

 

[telecaster]

Thé tube test machine has an accompanying chart where each tube type has a minimum reading that is considered end of life, and a maximum reading considered as New. When the tester gives you those reading numbers, he should give you the low and new values in order for you to make sense. Otherwise ask for those.

 

[telecaster]

I do not study tube data but my pair of GEC 6as7g is almost perfect.
MOV A1834 Pair Brown Curved Bases Cup Getters (1).pdf

Now that's some beauties!

 

[hp4fun]

Thé tube test machine has an accompanying chart where each tube type has a minimum reading that is considered end of life, and a maximum reading considered as New. When the tester gives you those reading numbers, he should give you the low and new values in order for you to make sense. Otherwise ask for those.

imho, the $250 ok gec 6as7g still has a better value than the $300+ strong nos chatham 6as7g pair in the earlier discussion.

In the 6AS7G thread, I started to understand more about the values.

xx%
-- some testers do output the percentage

gm = ????
-- other tests report the gm directly.
-- Usually the Gm value of the nos is larger than the nominal value on paper. e.g., 5693 is 1650, 5998 is 15000, 6AS7g is 7000 etc.
-- There is a minimum value. Maybe around 50-60% of the book value.

Ia
-- I can be wrong about this, but I think many others report this value without the units. For example, 76/66, minimum 36/36.

These three do not need to be proportional because they are tested in different ways.

For example, you can have 60% in the #1 test, but the gm percentage is maybe 58%, and your Ia is different.