Tube Rolling w/Crack

Dr. Toobz · 753359

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Offline Chris65

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Reply #1275 on: October 25, 2015, 02:23:04 AM
According to the info I've found, an equilateral triangle code is Philips, Copenhagen made. The Heerlen code is a right angled triangle.
e.g this page shows the different codes, scroll down a bit.
http://www.audiotubes.com/mullcode.htm


Offline Rocketman248

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Reply #1276 on: October 25, 2015, 02:49:18 AM
Yeah, mine has the right angled triangle, indicating a Heerlen factory.  Mine looks just like the first one on the Tube-Classics page.

Nick DeBrita
Yokosuka, Japan

Offline Chris65

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Reply #1277 on: October 25, 2015, 02:59:38 AM
Quote from: Rocketman248 on October 25, 2015, 02:49:18 AM
Yeah, mine has the right angled triangle, indicating a Heerlen factory.  Mine looks just like the first one on the Tube-Classics page.

Thanks, a bit hard to tell from the photo. You scored a nice tube!


Offline Doc B.

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Reply #1278 on: October 25, 2015, 06:00:53 AM
The fingerprints on the plate look like they could possibly be those of Th.P.Tromp himself.

Dan "Doc B." Schmalle
President For Life
Bottlehead Corp.

Offline Tom-s

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Reply #1279 on: October 26, 2015, 09:50:14 AM
For tube rolling other tubes than 12au7's, what would you guys suggest?
Any drop-in options that work good via adaptors?
With the R1 resistor mod on speedball boards optimization for the E80CC and 12bh7 is possible, but there must be other options besides these?
Also saw the 5687 switch mod. More options?


Offline JamieMcC

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Reply #1280 on: October 26, 2015, 10:49:09 AM
Quote from: Tom-s on October 26, 2015, 09:50:14 AM
For tube rolling other tubes than 12au7's, what would you guys suggest?
Any drop-in options that work good via adaptors?
With the R1 resistor mod on speedball boards optimization for the E80CC and 12bh7 is possible, but there must be other options besides these?
Also saw the 5687 switch mod. More options?

You can have lots of fun with 6sn7 and 6F8G  variants there are some great sounding tubes but you will need the relevant xyz to 12au7 socket adapter.


Shoot for the moon if you miss you will still be amongst the stars!

Offline i luvmusic 2

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Reply #1281 on: October 27, 2015, 01:16:55 PM
6CG7 is a nice tube too i prefer these tube over 12AU7's at least for me anyway.


Offline mcandmar

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Reply #1282 on: October 27, 2015, 01:21:46 PM
6CG7 / 6FQ7 is my favorite too, one of the cleanest sounding of the 9 pins.

M.McCandless

Offline Tom-s

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Reply #1283 on: October 28, 2015, 09:39:37 AM
Thanks guys! Bought the needed adapters (4 weeks in transit).
What are the R1 resistances on the speedball boards to use with those?


Offline Johnny lolo

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Reply #1284 on: October 29, 2015, 12:21:56 AM
Hi all, just joined the Bottlehead crack club :)

I'm curious what power tube my amp came with. It was bought a few months ago and the label says USA with 6080  in an octagon below it. No other text. It sounds pretty good! Thanks


Offline mcandmar

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Reply #1285 on: October 29, 2015, 04:13:14 AM
An octagon around the part number means its an RCA tube.

M.McCandless

Offline Johnny lolo

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Reply #1286 on: October 30, 2015, 02:10:55 AM
Good to know, thanks


Offline i luvmusic 2

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Reply #1287 on: October 30, 2015, 08:52:17 AM
Quote from: mcandmar on October 27, 2015, 01:21:46 PM
6CG7 / 6FQ7 is my favorite too, one of the cleanest sounding of the 9 pins.

Do you have any particular brand of 6CG7 you prefer?



Thanks!


Offline mcandmar

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Reply #1288 on: October 30, 2015, 09:57:06 AM
Cant say that i do, from the few i have tried they seem to be very similar to each other unlike the 12au7 variants which vary wildly.

M.McCandless

Offline moriez

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Reply #1289 on: November 11, 2015, 04:12:39 AM
Hey gang. Another very happy Crack owner reporting  :-*

Besides the wealth of info I think this thread also lends itself for some tube trading perhaps? I haven't the slightest interest in stacking 'em if they don't please me.

Anyone preferably in Europe who's interested in a TungSol 6080WA (solid graphite) or Mullard CV4003 (M8136)? Very low hours on both.
I'm especially after quality (JHY) CBS Hytron 5814a or something very, very similar. Could be interested in a TungSol 7236 as well.


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