Tube Rolling w/Crack
- Thread starter Dr. Toobz
- Start date
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You're also missing some wiring on your headphone jack.
Refer to the manual that came with your kit and the section about wiring up the headphone jack.
Zarno said:
If you did force the plugs in incorrectly, you may have damaged/spread the socket for the small pin. I think this could result in a poor connection for the small pin and could give you the scratchy noise. I would try using the headphones on another device to see if that is the issue.
There is a value change for R1 on the small PC board up front for the E80CC. I am remembering that 470 ohms is a good choice for that position.
1. Don't use too much heat.
2. Don't apply any force before the solder joint is 100% melted. (Resin helps to get it flowing)
3. If cutting the resistor makes removal more easy, is usually do in more difficult situations. As a board is way harder to get vs a new 5 cent resistor.
4. Plan ahead, build in some sort of switch, so you never have to abuse the speedball board again and can switch between 12AU7 and E80CC daily
.
5. Plan further ahead, you might want 12BH7 some day, make it a 3 way switch. Really 12BH7's are a very interesting sidestep from the standard 12AU7's. More mellow/air/details compared to the average 12AU7. (oh and the 5731A's are needed for that).
6. I don't know, enjoy your turkey this evening?
Good luck!
2. Don't apply any force before the solder joint is 100% melted. (Resin helps to get it flowing)
3. If cutting the resistor makes removal more easy, is usually do in more difficult situations. As a board is way harder to get vs a new 5 cent resistor.
4. Plan ahead, build in some sort of switch, so you never have to abuse the speedball board again and can switch between 12AU7 and E80CC daily
. 5. Plan further ahead, you might want 12BH7 some day, make it a 3 way switch. Really 12BH7's are a very interesting sidestep from the standard 12AU7's. More mellow/air/details compared to the average 12AU7. (oh and the 5731A's are needed for that).
6. I don't know, enjoy your turkey this evening?
Good luck!
Love Rhino
Member
Hi all! I’m currently working on my 2nd crack, my first is +sb with some cap upgrades. I’m a big fan of tube rolling, and I have several different varients with and without adapters: 12bh7, e80cc, 6sn7, 6f8g, 6c8g, 7193 and cv6, 6j5...the list goes on and on.
I’ve discovered a weird problem with my 6c8g tubes. The 6f8g works just fine with speedball, but when I use the 6c8g the sound is muted, with distortion happening around the 9pm mark on the volume. I’ve tested the adapter with 6f8g on the crack, and with the 6c8g on a darkvoice amp, and no problems. I’ve also tried different 6c8g tubes and had the same issue.
Any ideas why this particular variant is being so fussy?
I’ve discovered a weird problem with my 6c8g tubes. The 6f8g works just fine with speedball, but when I use the 6c8g the sound is muted, with distortion happening around the 9pm mark on the volume. I’ve tested the adapter with 6f8g on the crack, and with the 6c8g on a darkvoice amp, and no problems. I’ve also tried different 6c8g tubes and had the same issue.
Any ideas why this particular variant is being so fussy?
That is not a compatible tube. It has twice the amplification factor, higher plate impedance, and lower transconductance. Other than all of those differences being not ideal for a tube substitute in the Crack, when you plug it in the operating point will be so far out of whack that neither the 6C8 nor the 6080 will be able to pass any signal.Love Rhino said:
A voltage check will also verify this. Terminals 1 and 5 are going to be very, very close in DC voltage to terminals 2 and 4.
(This high voltage on terminals 1 and 5 may also destroy the large Speedball PC board over a reasonably short period of time)
