Calling Rockstah - 1959 HW to 12xxx series spec

ScottW · Post by **ScottW** » Thu Jan 24, 2008 1:30 am

vkaxeman wrote: Multi-Meter on 2 volts dc:
V4 = .043 volts
V5 = .034 volts ( This tube is still running low )
V5 = .040 volts
V6 = .039 volts

Jeez man, you're done! Rock on!

Coot Boy · Post by **Coot Boy** » Thu Jan 24, 2008 1:33 am

What happened to the EH tubes.

vkaxeman · Post by **vkaxeman** » Thu Jan 24, 2008 1:43 am

Coot Boy wrote:What happened to the EH tubes.

One of the 4 EH tubes was really wacked out. Read extremely high.
So I went back to the JJ's.

vkaxeman · Post by **vkaxeman** » Fri Jan 25, 2008 1:20 am

Wow! Took longer to upload the songs to Soundclick then it did to Bias the amp!

Rockstah, This thing flat out kicks Axx! Talk about feel. This amp has it now! It's a pleasure to stand in front of this thing now as it rips your head off!

This time I recorded the tracks with 2 mics at the same time. SM57 and C414. Curious to see what everyone thinks. I personally like the C414 better. Sounds closer to what the amp really sounds like live and in person. Also installed a Darkburst in my Baretta and have some recorded tracks of it to. There are also 2 mp3's of the amp right before I put the Dual Tap in for comparison. Channel 1 Tracks: Everything Dimed Except Presence on 8 and Treble on 9 due to chassis out of box. Channels Jumped Tracks: Same as Channel 1 plus Channel 2 Volume on 6.

Check out mp3's of this 400volt 12 series Dutch treat at:
http://www.soundclick.com/bands/default ... dID=717849

Next up:
1. Put the Mustards back in. Make MP3's.
2. Put the new Mercury choke in. Make MP3's.
3. Put the PPIMV in. Make MP3's Late At Night!

4. Make it a 2203 for more Sustain from the Gain. Make MP3's.
5. Try out different speakers. Make MP3's.

FN-A-IM

thousandshirts · Post by **thousandshirts** » Fri Jan 25, 2008 1:33 am

That's it, man! Keep it coming! Boy, am I going to be sad if this thread ever ends.

harddriver · Post by **harddriver** » Fri Jan 25, 2008 1:42 am

Sounds really good!

So what specs are you at right now in these clips after the new dual tap. Are you playing straight up dimed or dimed into an attenuator I don't remember what you've stated?

The amp is very different from where you started, great job!

rockstah · Post by **rockstah** » Fri Jan 25, 2008 6:47 pm

it sounds really good. i can tell you are enjoying playing it.

so you did work out the bias situation to your satisfaction?

can u hear the clipping sound like i hear on the clips?

what speakers are you running? (i know i know - i forget though.)

what impedence is the amp set at?

what is the current spec ?

filtering?
i would like to hear more filtering in the phase inverter... better yet, put one of your dual 50's back in and jumper it for 100u on the phase inverter and make another clip.

vkaxeman · Post by **vkaxeman** » Sat Jan 26, 2008 1:45 am

harddriver wrote:Sounds really good!

So what specs are you at right now in these clips after the new dual tap. Are you playing straight up dimed or dimed into an attenuator I don't remember what you've stated?

The amp is very different from where you started, great job!

Thanks!!!!

Current Specs:
v1a 330/820
v1b .68/820
v1a coupling .022
v1b coupling .0022
vol1 bright 500
tone stack 500
v2a .68
Output Coupling .1
Screens 16u
Mains 32u
V3 16u
Preamp 32u
Presence .1

Dimed no attenuator.

vkaxeman · Post by **vkaxeman** » Sat Jan 26, 2008 1:54 am

rockstah wrote:it sounds really good. i can tell you are enjoying playing it.
so you did work out the bias situation to your satisfaction?

Yes, I finally understand how to measure and set the bias.

rockstah wrote: can u hear the clipping sound like i hear on the clips?

If you mean the cutting out / choppy sound then yes, if no, then I'm not sure what you mean.

rockstah wrote: what speakers are you running? (i know i know - i forget though.)

Celestion G12H30 Heritage.

rockstah wrote: what impedence is the amp set at?

16 ohms

rockstah wrote: what is the current spec ?
filtering?

Current Specs:
v1a 330/820
v1b .68/820
v1a coupling .022
v1b coupling .0022
vol1 bright 500
tone stack 500
v2a .68
Output Coupling .1
Screens 16u
Mains 32u
V3 16u
Preamp 32u
Presence .1

rockstah wrote: i would like to hear more filtering in the phase inverter... better yet, put one of your dual 50's back in and jumper it for 100u on the phase inverter and make another clip.

Alright, I'll try that.

rockstah · Post by **rockstah** » Sat Jan 26, 2008 1:52 pm

also bring the mains back up to 50u.

vkaxeman · Post by **vkaxeman** » Sat Jan 26, 2008 3:37 pm

rockstah wrote:also bring the mains back up to 50u.

Wil do but just To confirm:

You are saying replace the V3 PI 16/16cap wired 16u/one side only with a 50/50 cap wired one side and then jumped to the other for 100u?

and

Replace the 2 mains 32/32 caps with 50/50 caps wired the same as current?

And do you want me to make the V3 PI change first, then make an MP3, then change the Mains and make another MP3?

Thanks!

rockstah · Post by **rockstah** » Sat Jan 26, 2008 3:47 pm

vkaxeman wrote:
rockstah wrote:also bring the mains back up to 50u.
Wil do but just To confirm:

You are saying replace the V3 PI 16/16cap wired 16u/one side only with a 50/50 cap wired one side and then jumped to the other for 100u?

and

Replace the 2 mains 32/32 caps with 50/50 caps wired the same as current?

And do you want me to make the V3 PI change first, then make an MP3, then change the Mains and make another MP3?

Thanks!

yes throw a jumpred dual 50u in the PI. = 100u on PI

it would be great to hear both mods one at a time but if you want just do both mods and then make a clip.

vkaxeman · Post by **vkaxeman** » Sat Jan 26, 2008 9:42 pm

Put 100u on V3 PI (50/50 jumpered) and 50u on Mains (50/50 jumpered connected to 50/50 jumpered). It has become real harsh on the hgh end again and not real plesant to stand in front of. I liked it better the other way. Not sure if you can tell that from the mp3s but what do you think/ hear?

MP3s:
Dual Tap PT 100u V3PI C414
Dual Tap PT 100u V3PI SM57
Dual Tap PT 100u V3PI 50u Mains C414
Dual Tap PT 100u V3PI 50u Mains SM57

at:
http://www.soundclick.com/bands/default ... dID=717849

rockstah · Post by **rockstah** » Sat Jan 26, 2008 10:25 pm

wow the very thing i was trying to get rid of got worse! ok put back the filtering the way you had it and do these two things one at a time.

put a .022u on v1b instead of the .0022u- make a clip
then lift the wire off of pin 2 of v2 and put a 220k resistor on pin2 and reconnect the wire to the end of the resistor. leads as short as possible.
(it has been discussed about a similar mod on v3 - i am clear on it and i want the resistor on v2 , pin 2 ) make a clip.

i want to hear these two clips. and keep letting me know what you like better with each mod as u just did as well.

also point me to the most recent chassis shot of the amp.

each amp is different and yours is a little on fire in the high end department, we will fix it.

Mark

Flames1950 · Post by **Flames1950** » Sat Jan 26, 2008 10:32 pm

You're sure it's not just the conversion to mp3 that's making the high end grating? It's never an ideal way to go, although mp3's are an internet necessity.