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Little Dot Tube Amps: Vacuum Tube Rolling Guide - Page 399

post #5971 of 10500
Quote:
Originally Posted by gibosi View Post
 

 

The pin on top is tied to the cathode for one of the triodes. A special adapter is needed, 6F8G on top and 6SN7 on the bottom:

 

http://www.ebay.com/itm/1pc-6F8G-TO-6SN7-6SL7-TUBE-ADAPTER-/190991571450?pt=Vintage_Electronics_R2&hash=item2c77fc19fa

 

For the adapter it should be easy to reconfigure my adapter for that tube but Holy schiit that(6F8G)tube is not cheap.

post #5972 of 10500
my RCA was 25 shipped... Lol
post #5973 of 10500
Quote:
Originally Posted by i luvmusic 2 View Post
 

I bought mine from the tubedepot $19 for 100pcs + killer USA shipping to Canada but still cheaper than buying it locally.Thanks! for the link.

i got them here                                   http://www.amplifiedparts.com/products/tube_accessories?filters=Type%3DBoxes

post #5974 of 10500

Hi i luvemusic 2,

 

I too, store my tubes in shoe boxes which are marked with a sticker as to content:

 

 

Most octals I buy come without boxes (I guess since they are used). In order to remember how they sound I put a little paper with the designation, manufacturer and date and my rating of the tube (OK, VG, Excellent, Superb or NG) on the tube itself with small rubber bands. When I use the tube I pull off the paper and put it back on when switching tubes.

 

A large rubber band is used to hold the box together with the top. If the tubes have boxes, I store them in the boxes, again with the little paper stuck on with rubber bands.

 

If there are just a few tubes in a box I put in a piece of bubble wrap or similar to prevent the tubes from rattling around. If I need to remember a matched or near pair, I put a rubber band around both together.

 

This system is unsophisticated but cheap, and it works. Sometimes the markings on the tube wear off, or they are very hard to read, and then the little paper comes in extra handy.

 

Presently I am using a Dutch 1975 6DJ8/ECC88 Tektronix Amperex A-frame tube as driver and a near pair of Sylvania 6SL7GTW as power tubes. This is a very nice and sweet sounding combination.

post #5975 of 10500

Hi Mordy,

 

Simple and effective system you have - i have started labelling my boxes as well and will move along to putting pieces of paper with notes as to its sound. Thanks for the tip!

post #5976 of 10500

Btw, anyone know if it is safe to use a CV181 as a replacement tube for the 6SN7 (which I plan to roll once my adapter and socket saver arrives) in my LD Mk 3? Read in the 6SN7 Addicts thread that it is not a direct replacement and may blow power transformers over time...

post #5977 of 10500

New or old CV181s?

post #5978 of 10500
Quote:
Originally Posted by Rossliew View Post
 

Btw, anyone know if it is safe to use a CV181 as a replacement tube for the 6SN7 (which I plan to roll once my adapter and socket saver arrives) in my LD Mk 3? Read in the 6SN7 Addicts thread that it is not a direct replacement and may blow power transformers over time...

 

Are you going to be using this tube as a driver? Or as power tubes? The reason Nic is asking, "new or old?" is that the new ones are electrically identical to a 6SN7 with .6A heaters, while the old ones are essentially a ECC32 and have .9A heaters. Either way, it should be safe to use either new or old CV181 as a driver or as power tubes in your LD.

 

To use as a driver, you will need an AC to DC wall adapter putting out at a bit more than .9A at 6.3V. To use as a power tube, it is plug and play with an octal to 9-pin socket adapter, as the LD can safely use power tubes with heaters drawing up to around 1.0A per tube.

post #5979 of 10500
Quote:
Originally Posted by MIKELAP View Post
 

i got them here                                   http://www.amplifiedparts.com/products/tube_accessories?filters=Type%3DBoxes

 

Thanks For the link!

Quote:
Originally Posted by kvtaco17 View Post

my RCA was 25 shipped... Lol

Are you refering to 6F8G?i did not see anything less than US $29 + shipping.For 6SN7 i learn how to buy cheap(Thanks to Mordy and Gibosi)most of the time i buy them by atleast a pair or more in this way it's cheaper for example i got 6 6SN7 GTA  RCA blackplate for US $45 shipped.

 

Quote:
Originally Posted by mordy View Post
 

Hi i luvemusic 2,

 

I too, store my tubes in shoe boxes which are marked with a sticker as to content:

 

 

Most octals I buy come without boxes (I guess since they are used). In order to remember how they sound I put a little paper with the designation, manufacturer and date and my rating of the tube (OK, VG, Excellent, Superb or NG) on the tube itself with small rubber bands. When I use the tube I pull off the paper and put it back on when switching tubes.

 

A large rubber band is used to hold the box together with the top. If the tubes have boxes, I store them in the boxes, again with the little paper stuck on with rubber bands.

 

If there are just a few tubes in a box I put in a piece of bubble wrap or similar to prevent the tubes from rattling around. If I need to remember a matched or near pair, I put a rubber band around both together.

 

This system is unsophisticated but cheap, and it works. Sometimes the markings on the tube wear off, or they are very hard to read, and then the little paper comes in extra handy.

 

Presently I am using a Dutch 1975 6DJ8/ECC88 Tektronix Amperex A-frame tube as driver and a near pair of Sylvania 6SL7GTW as power tubes. This is a very nice and sweet sounding combination.

I did put rubber band(2 per tube) on all of my tubes without case to prevent them from knocking each other but that did not helped.

By labeling the tubes is a very good idea there are times that a particular tube it sound nice then i switch,when i try to find that tube can't remember which one.Thanks You!

post #5980 of 10500

i luvemusic 2 I made an offer, it was listed at $40 and I offered $25 and he accepted! Just gotta work the system to get deals!

post #5981 of 10500
Quote:
Originally Posted by kvtaco17 View Post
 

i luvemusic 2 I made an offer, it was listed at $40 and I offered $25 and he accepted! Just gotta work the system to get deals!

Yup i wondered how did you get it that low, anyhow did you try it with your LD yet

post #5982 of 10500

Time to do some electronic chassis RECYCLING for my Tube storage because i'am cheap.:biggrin:

post #5983 of 10500
Quote:
Originally Posted by i luvmusic 2 View Post
 

Yup i wondered how did you get it that low, anyhow did you try it with your LD yet

Nope the adapted is sitting at the USPS hub in St.Paul... probably another day or 2...

post #5984 of 10500

A trio of shiny baubles arrived today.

 

The short one appears to be all chrome.

Hard to photograph, like a mirror behind the glass. :D

post #5985 of 10500
Quote:
Originally Posted by gibosi View Post
 

 

Are you going to be using this tube as a driver? Or as power tubes? The reason Nic is asking, "new or old?" is that the new ones are electrically identical to a 6SN7 with .6A heaters, while the old ones are essentially a ECC32 and have .9A heaters. Either way, it should be safe to use either new or old CV181 as a driver or as power tubes in your LD.

 

To use as a driver, you will need an AC to DC wall adapter putting out at a bit more than .9A at 6.3V. To use as a power tube, it is plug and play with an octal to 9-pin socket adapter, as the LD can safely use power tubes with heaters drawing up to around 1.0A per tube.

Hi Gibosi / Nic, i plan on using them as plug in replacements for the stock power tubes. I have ordered the adapters and socket savers so once these arrive, i can start ordering some 6SN7s. Does this mean i can safely use both old and new CV181 tubes?

 

On 6SN7 tubes, can I also safely use the different variants like 6SN7GTA/GTB/GTC ones? Thanks again!

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