NAD Finally my 1st Marshall

[billboogie]

$1100 on C List so I had to pull the trigger.
Lots of tone options with the pull pots.
Got a show tomorrow outside and it's coming with me.
Anybody mess with the bias? Little hotter or colder? Any sweet spots?

 

[Chester Nimitz]

I hear they were biased cold from the factory.

Nice score man, congrats !

 

[Racerxrated]

Congrats! I run 34s at around 74ma for each pair, and 6550s/KT88s a little hotter, around 100/pair. You can run any pair of octal tubes, with outside chassis test points. Bring a boost pedal if you need heavy tones....

 

[mudf00t]

Is that a Jubilee head?

 

[MetalHeadMike]

Nice man

 

[messenger]

Reissue or Original?

 

[SDMF38]

Killer score!

 

[billboogie]

Congrats!!

Thanks Reza really enjoying it.

I hear they were biased cold from the factory.

Nice score man, congrats !

Congrats! I run 34s at around 74ma for each pair, and 6550s/KT88s a little hotter, around 100/pair. You can run any pair of octal tubes, with outside chassis test points. Bring a boost pedal if you need heavy tones....

It's going to my tech for fresh tubes and a proper bias. Thank you for that info.

Is that a Jubilee head?

Nice man

Reissue or Original?

Thank you. Yes it's a reissue Jube

 

[Racerxrated]

Its really simple to bias it yourself, just get a multimeter and take the red and black probe wires and insert the black into the black test point, and the red into one side or the other (right side for right pair, left for the left pair). Then with your amp on, and hooked up to a cab take it off standby and with the meter turned on and set to 200m check the number. There's a chart right next to the test points telling you the range-the number will be for each pair of tubes. 34s should be at least 60 per pair..mine was around 40 when I checked. Way cold. You can get a multimeter for like 10 bucks.
Just take the back panel off and the test points are right there, to the right of the power tubes.

 

[Racerxrated]

Also, I would crank the output master at least to 6....and then use the lead master as my volume. If you need the clean channel then leave the rhythm clip pushed in, and balance both volumes. I don't need a clean, so I crank the output master to 10 and go from there. The Jubilee has the best master of any Marshall I've tried. My 1980 2203 goes from 0-10 by 2 on the master volume lol.

 

[Racerxrated]

I'm
Really curious about these amps, has anyone made a really good video of one yet?

There are a few out there, but these amps need a boost pedal to get heavy. Someone should make one using a boost pedal!

 

[mchn13]

Helluva first marshall congrats. Gotta get one myself.

 

[zewango]

When you can get both volumes up its a great sounding amp. Mine also came with the bias super low from the factory.

 

[skoora]

You need to see what the plate voltage is before you just arbitrarily pick a setting for the tubes. I would say with manufacturing techniques today the PT's are probably pretty consistent on these Marshall's. So you might be able to find spec on what it is approximately. My guess is between 450 and 480. But that being said, in general it's hard to go wrong with 28-35mA per tube. One (used to be respected ) builder I know likes mid 20's for tube life. I've found once experimenting on a super lead build I had that the audible difference between 25 and low 30's was virtually indistinguishable. The B+ on that was 490 so it called for a lower draw setting for the tubes. I have a Mesa Stiletto that factory was very cold with certain settings. Actually got down to 13-14mA when on a dirty setting with tube rec and spongy. Up to about 30 on clean with bold and SS rec. Out of curiosity I had a bias mod installed and the difference I hear is completely negligible. I turn it up a fair bit too, using attenuation so I'm hearing the power section working. Usually if you discover the comfort range of the tubes you put in you can just adjust the bias within that range until you like what you hear.

I don't trust modern tubes to handle 75% dissipation. I don't want to risk losing components on the board or damage pcb traces, if I was to have a serious tube failure.

 

[Racerxrated]

You need to see what the plate voltage is before you just arbitrarily pick a setting for the tubes. I would say with manufacturing techniques today the PT's are probably pretty consistent on these Marshall's. So you might be able to find spec on what it is approximately. My guess is between 450 and 480. But that being said, in general it's hard to go wrong with 28-35mA per tube. One (used to be respected ) builder I know likes mid 20's for tube life. I've found once experimenting on a super lead build I had that the audible difference between 25 and low 30's was virtually indistinguishable. The B+ on that was 490 so it called for a lower draw setting for the tubes. I have a Mesa Stiletto that factory was very cold with certain settings. Actually got down to 13-14mA when on a dirty setting with tube rec and spongy. Up to about 30 on clean with bold and SS rec. Out of curiosity I had a bias mod installed and the difference I hear is completely negligible. I turn it up a fair bit too, using attenuation so I'm hearing the power section working. Usually if you discover the comfort range of the tubes you put in you can just adjust the bias within that range until you like what you hear.

I don't trust modern tubes to handle 75% dissipation. I don't want to risk losing components on the board or damage pcb traces, if I was to have a serious tube failure.

Maybe you aren't familiar with the reissue Jubilee. They have the bias check points on the outside of the chassis, with the adjustment screws also right there. And, they've printed a chart to let you know the range of bias they recommend for each type of power tube that one might want to run. So really, no need to measure plate voltage with this amp unless you think Marshall might be full of shit. Lol.

 

[billboogie]

Its really simple to bias it yourself, just get a multimeter and take the red and black probe wires and insert the black into the black test point, and the red into one side or the other (right side for right pair, left for the left pair). Then with your amp on, and hooked up to a cab take it off standby and with the meter turned on and set to 200m check the number. There's a chart right next to the test points telling you the range-the number will be for each pair of tubes. 34s should be at least 60 per pair..mine was around 40 when I checked. Way cold. You can get a multimeter for like 10 bucks.
Just take the back panel off and the test points are right there, to the right of the power tubes.

Thank you. I pulled the back today and the chart is very informative, This is something I can definitely handle.

Also, I would crank the output master at least to 6....and then use the lead master as my volume. If you need the clean channel then leave the rhythm clip pushed in, and balance both volumes. I don't need a clean, so I crank the output master to 10 and go from there. The Jubilee has the best master of any Marshall I've tried. My <a href="tel:1980 2203">1980 2203</a> goes from 0-10 by 2 on the master volume lol.

Really opens up with the global between 6-8. I prefer the 50w setting as it's sounds just a tad darker.
The BE OD in that clean channel was really nice.

Helluva first marshall congrats. Gotta get one myself.

You should do it. There is one on Reverb for $1200. There are quite a few familiar tones and the clean side is a treat.

Helluva first marshall congrats. Gotta get one myself.

 

[billboogie]

Amp was great in the band setting, just cut right through,
Fresh power tube quartet on the way. It came with Ruby's, any tube suggestions from
the Jubilee experienced? I put an old Sylvania pre amp tube in P1 after trying a few.
Really happy with the gain structure, I don't play metal so there is plenty of gain for me.

 

[Racerxrated]

Like a vintage Marshall this one likes all the usual suspects in the preamp slots..Chinese 8th gen, Mullards(vintage), Amperex, Siemens, RCA, Telefunken....if you can find them. I've developed a pretty good stash over the years so I don't even buy new production anymore. Doug's or KCA tubes usually have some vintage pre tubes available, and RT member Snave sells new old stock Chinese 8th gen from time to time. Just experiment with each tube in each slot, maybe a 12AT7 in the pi slot.

 

[Rick Lee]

Smoking deal there. What's the head underneath in the photo?

 

[billboogie]

Like a vintage Marshall this one likes all the usual suspects in the preamp slots..Chinese 8th gen, Mullards(vintage), Amperex, Siemens, RCA, Telefunken....if you can find them. I've developed a pretty good stash over the years so I don't even buy new production anymore. Doug's or KCA tubes usually have some vintage pre tubes available, and RT member Snave sells new old stock Chinese 8th gen from time to time. Just experiment with each tube in each slot, maybe a 12AT7 in the pi slot.

I have a few preamp tubes here as well as a couple you mentioned. Thank you I will definitely
Do some swapping.

Smoking deal there. What's the head underneath in the photo?

The price was the final straw, lots of good gear for sale at reasonable prices these days.
The head below is a Phaez Pasadena 50w. El34's. Fun amp that is very punchy.