Bottlehead Forum

Bottlehead Kits => Crack => Topic started by: Crackawaka on May 08, 2019, 06:45:10 AM

Title: Question: More heat on chassis with 6080 tube vs. 6AS7G?
Post by: Crackawaka on May 08, 2019, 06:45:10 AM

Hi all,

I bought an RCA 6AS7G tube and ran it for about 4 hours yesterday. I didn’t notice a difference in sound the way I did when I rolled in a (Made in GB) Mullard 12AU7, but I did notice that the chassis wasn’t as warm as when I run the 6080 tube that came with it. Is this typical?

Title: Re: Question: More heat on chassis with 6080 tube vs. 6AS7G?
Post by: Paul Birkeland on May 08, 2019, 07:50:16 AM

You could measure the voltages in the amp with each tube to make a determination.  (The voltages and whether or not you have a Speedball will quantify any heat difference)

Overall this is pretty atypical.  I would actually expect the 12AU7 to make a bit more of a difference in terms of how much heat is generated inside the chassis.

Title: Re: Question: More heat on chassis with 6080 tube vs. 6AS7G?
Post by: Crackawaka on May 08, 2019, 08:08:58 AM

Thanks Paul! I’ll keep that in mind. I’m still “braining in” the stock Crack before I add the speedball. The 6AS7G is a taller tube and I thought that might have something to do with the heat that is generated/dispersed at the base.