Tube Rolling w/Crack

[Maynard]

Hi does anyone know anything about this tube? ECC82 12AU7 18mm long Plates 45° D Getter, and how it would sound in the crack?

[Paul Birkeland]

Hi does anyone know anything about this tube? ECC82 12AU7 18mm long Plates 45° D Getter, and how it would sound in the crack?

That could probably be anything.  Is there any acid etching on the glass?  Can you post a couple photos of the tube?

[Maynard]

It's a valvo on eBay at the moment

[Maynard]

Can anyone tell me the sound characteristics of the svetlana 6h13c? Just started using on over the stock 6080 in conjunction with an rca cleartop and the sound seems warmer and fuller.

[JamieMcC]

Can anyone tell me the sound characteristics of the svetlana 6h13c? Just started using on over the stock 6080 in conjunction with an rca cleartop and the sound seems warmer and fuller.

Shhh or every one will want one and soon you wont be able to find them under $10 each NOS try it paired with a E80cc up front 

[Maynard]

Hehehe...ok mums the word👼👼👼

[Maynard]

Actually would this e80 cc work in the crack I've read somewhere that it's not advisable to use. Too much heat generation?

[JamieMcC]

Actually would this e80 cc work in the crack I've read somewhere that it's not advisable to use. Too much heat generation?

From the horses mouth

Yes, the E80CC will work in the stock circuit, it just isn't optimized for that particular tube.

-PB

[mcandmar]

http://www.ebay.co.uk/itm/5-x-CV491-ECC82-Electron-tubes-high-spec-Unusual-with-blue-print-/151506812480?ssPageName=ADME:B:SS:IE:3160

Another source for RFT tubes, this time in a military guise.  I believe the CV491 designation was for tubes that were subject to stringent testing. I already bought a set of these and they all tested exactly the same.

[MattTCG]

Hey guys, I'm struggling to find the right driver tube to complement my hd800. Currently using the ts5998 which I love. The stock drive tube was noisy. Then I tried some RCA and Conn clear tops. They didn't do much for me. I'm looking for a lusher sound and a little more bass.

Suggestions are appreciated.

thanks...

[wullymc]

I have DT880's which are considered bright.

Right now I am using a 2399 (basically a 5998) and a Mullard CV4002 which is the equivalent to a 12au7.  Mullards are known to tone down the bright.  Might be worth a shot!

Take care...DAve

[Klots]

Hi! Few quick question.

I know that there has been many talk about mod to use E80CC tube in crack, but I ordered a E80CC tube and a speedball few days a go. Tube will arrive next week and speedball will arrive in January I guess, so my question is. Can I use E80CC tube in my un-modified crack (5998 as output tube) until my speedball arrives or just to test it for a evening? I just dont want to ruin anything in my crack, but my CBS5814A broke to pieces yesterday and this rca 12au7 that came with my crack is very microphonic and it is not nice to use it.

And my 5998 tube is making some high pitch squeal/whistle. When I tap on the tube, it goes away. All voltages etc are correct. I resoldered every joint and nothing changed. This sound appears about 30min after turning amp on. Is it common with tubes that they can produce such a high pitch sound and can it mess something up in my Crack? Can anything else cause this high pitch sound?

Thanks!


EDIT: Made a video about the squeal with my phone.

A little update: It is not the tube. I put my GE 6AS7GA tube in again and have been listening for a few hours. It makes the noise too, slightly different from 5998 but still. If I tap on the tube then it goes silent and then starts again. This mystery sound is only heard in left channel. What component in Crack could make the output tube to sqeal? All ideas welcome. Thanks!

[borism]

Since it is responsive to tapping on the tube but is not specific to a tube I would wonder about the solder on the tube socket and reflow all the pin connectors.

[Klots]

Since it is responsive to tapping on the tube but is not specific to a tube I would wonder about the solder on the tube socket and reflow all the pin connectors.

I will resolder all pin connectors tomorrow. I bought two new sockets (same that comes with crack) and I will replace the tube socket when they arrive. Just to see if that changes anything. New clean solderjoints to all pins.

Small update: If I unplug headphones and plug them in again, it goes quiet and then in some time it starts again. That headphones out and in works everytime.

[Nick Tam]

Hey guys, I'm struggling to find the right driver tube to complement my hd800. Currently using the ts5998 which I love. The stock drive tube was noisy. Then I tried some RCA and Conn clear tops. They didn't do much for me. I'm looking for a lusher sound and a little more bass.

Suggestions are appreciated.

thanks...

How bout a less resolving tube that's orientated towards warmth? I found the TS5998 to be sibilant at times with a wrong combination of input tube and headphones so less high end, less resolving, more bass does the trick. Problem is there aren't many tubes that fit your  bill other than the Sylvania GB6080 and the Bendix 6080WB

If you can get a Bendix tube it might just do the trick. It's a superior tube to the 5998 with tighter bass and faster pace overall