Another Big Bottle Rocket Underway

Bob S · Post by **Bob S** » Sun Apr 21, 2013 6:03 pm

It's been pretty quiet on the TW front lately so I thought I'd post this.
Started life as an Express.
Will get KT66's (5k2 OT)
Cathode bias - 180-220 ohm/220uF.
New cab made by ampmike - stunning.
Should be firing it up this week.

Reeltarded · Post by **Reeltarded** » Sun Apr 21, 2013 6:53 pm

Great cab! I love the cap stack.

M Fowler · Post by **M Fowler** » Sun Apr 21, 2013 7:08 pm

Sweet looking amp Bob.

sepulchre · Post by **sepulchre** » Mon Apr 22, 2013 4:38 am

Yep! What they said. Soo clean!

JoeCon · Post by **JoeCon** » Mon Apr 22, 2013 11:38 am

Bob

Nice!
So a single bias resistor?
What was all the talk about the data sheet said the KT66 needed seperate resisitors? Something like 400 ohm each with seperate bypass caps too.
Anyone do this?

Thanks....

Zippy · Post by **Zippy** » Mon Apr 22, 2013 4:33 pm

https://tubeamparchive.com/viewtopic.ph ... t=rockster

Bob S · Post by **Bob S** » Mon Apr 22, 2013 11:19 pm

Thanks guys - I re-read the links.
Think I'll try single/split catthodes on a switch.
Gotta find out for myself if it makes any diff.
More later.

Post by **Colossal** » Tue Apr 23, 2013 1:41 am

Looking good as always Bob! Holy sh!t batman, that's a sweet looking cab!

mark enger · Post by **mark enger** » Tue Apr 23, 2013 5:04 am

Nice bob looks good, and thats a old wise-tale about seperate 500ohm resistors, i tried it, amp sounded like crap, as i recall i used 180 ohm or lower
befor amp started sounding good, but amp had low plate voltages, that amp was killer. mark

Blackburn · Post by **Blackburn** » Tue Apr 23, 2013 5:27 am

Awesome amp! Really hope you post a clip or two when she's done. Are those blue caps the old Mallory PVCs?

cbass · Post by **cbass** » Tue Apr 23, 2013 11:51 am

Looks sweet!

Bob S · Post by **Bob S** » Tue Apr 23, 2013 10:13 pm

Thanks guys.
The blue caps are old mallory's.
Unused & they check out fine.
We'll see what they sound like.
Should be tweeking this weekend.

Reeltarded · Post by **Reeltarded** » Tue Apr 23, 2013 10:28 pm

After that remark you made in that other thread?

You better start filing the name off that amp...

passfan · Post by **passfan** » Tue Apr 23, 2013 11:43 pm

What are you running on your B+ Bob?

Bob S · Post by **Bob S** » Wed Apr 24, 2013 12:10 am

Express Heyboer PT - around 405v B+.
I intend to start with RJ's posted voltages.
Lotsa excellent r & d done already.
I'll adjust the string to get there and see where that gets me.
I built a KT66 Rocket Reverb with fixed bias already so I have something to compare it to.

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