[JKDJedi]

I am taking a break from building amps for a bit but I may build one in purple heart just to see how many people I can annoy with the looks. This was my last in walnut.



So anyway this 55 has mids that just kind of slip onto your lap and lay there and purr.

Are those the Sylvania 7a4 there, I just did my initial roll of these...my lord... wow. I have a new set of headphones....

 

[fuzzroffe]

Thanks that is my personal amp. I prefer 6sn7 and 6as7g equivalents. I have amps with other tubes but I generally design around those two types. A few in here know the sound of my amps, the Incubus Elegan.

Very nice! I've been thinking about building a 6SN7/6AS7 headphone amp myself (like I don't have enough tube amps). I've drawn up a preliminary design, but it's hard to find the time to build it at the moment

 

[Paladin79]

Are those the Sylvania 7a4 there, I just did my initial roll of these...my lord... wow. I have a new set of headphones....

They are the military version of the 7A4, Sylvania VT-192's.

 

[Paladin79]

Very nice! I've been thinking about building a 6SN7/6AS7 headphone amp myself (like I don't have enough tube amps). I've drawn up a preliminary design, but it's hard to find the time to build it at the moment

I started out designing four identical amps to be used for my local audiophile group. We will be doing a 6sn7 and equivalent blind listening to determine what we consider to be the best such tubes in the world. At least 50 participants.

I have built close to fifty after friends loved the sound, it helps distinguish between 6as7g's as well. I also bought a lot of woodworking equipment, each amp is one of a kind.

 

[CaptainFantastic]

Pretty heated bidding on this one, and with 4 days to go. How high can it go? (I am sticking to my no-buying anymore 5998/421As policy this year)

https://www.ebay.com/itm/Vintage-Or...839532?hash=item48ede4ca6c:g:xEAAAOSwy2NfakE3

 

[JKDJedi]

Pretty heated bidding on this one, and with 4 days to go. How high can it go? (I am sticking to my no-buying anymore 5998/421As policy this year)

https://www.ebay.com/itm/Vintage-Or...839532?hash=item48ede4ca6c:g:xEAAAOSwy2NfakE3

I'm questioning the date on that tube.

 

[gibosi]

I'm questioning the date on that tube.

The date displayed on the tube is correct, 1958, week 4. However, the vendor's inference that it was manufactured in the 1940's is incorrect.

Edit: Sorry my typing can be pretty bad... 1958, week 5.

 

[JKDJedi]

The date displayed on the tube is correct, 1958, week 4. However, the vendor's inference that it was manufactured in the 1940's is incorrect.

I stand corrected...I question the date on the listing...(I meant to say)

 

[bcowen]

I'm questioning the date on that tube.

Is it cooperating, or pleading the 5th?

 

[bcowen]

The date displayed on the tube is correct, 1958, week 4. However, the vendor's inference that it was manufactured in the 1940's is incorrect.

Or week 5? Or am I looking at that incorrectly?

Regardless, that was an awesome year in the annals of human history. And not just for Tung Sol.

 

[Paladin79]

This is the Russian navy marking on a 1955 Svetlana winged C.

There are some differences between it and later such tubes. It has extra shielding at the bottom as well as different getter holders. Now I need to recheck some from the sixties to see if any are similar. From the 60's through the 80's they all look the same, the ones I have anyway. 6H5C was on the early versions, 50's, 60's 6H13C on the later.

 

[bcowen]

This is the Russian navy marking on a 1955 Svetlana winged C.

There are some differences between it and later such tubes. It has extra shielding at the bottom as well as different getter holders. Now I need to recheck some from the sixties to see if any are similar.

Ahoy, matey!

Man, the Russians had a way cooler Navy spec symbol than the US. But if I had a choice of being on a US-made ship or a Russian ship going into war, I'd most certainly pick the former.

 

[Paladin79]

Ahoy, matey!

Man, the Russians had a way cooler Navy spec symbol than the US. But if I had a choice of being on a US-made ship or a Russian ship going into war, I'd most certainly pick the former.

I should have Svetlana's coming from 1958 and 1959, they have the same getter holder as the 1955 but they lack the extra shield at the bottom the Russian navy version had. I need to retest later but I have not had a 6sn7 or 6080 test as high as the 55. Pins were a little corroded but I soon fixed those and replaced the solder. Not bad for a free tube lol. This shows the bottom shield better.

 

[JKDJedi]

I should have Svetlana's coming from 1958 and 1959, they have the same getter holder as the 1955 but they lack the extra shield at the bottom the Russian navy version had. I need to retest later but I have not had a 6sn7 or 6080 test as high as the 55. Pins were a little corroded but I soon fixed those and replaced the solder. Not bad for a free tube lol. This shows the bottom shield better.

Will have to to inspect my copy, after some coffee.

 

[Paladin79]

Will have to to inspect my copy, after some coffee.

Yours is a 60’s version as I recall. This is how a Russian friend put it:

"In the 50s, there were no large rockets, spaceships and strategic aircraft, so the best was done for the navy."

We did the same thing, think of all the sought after VT-231's etc. from that era.