Yes indeed, looking good. Soon... soon man. Get ready for TONE.
Ange
My first Rocket... Need help!
Moderators: pompeiisneaks, Colossal
"redo" finished!
Hello everyone,
I have finished re building my Rocket. I hope that this looks cleaner to everyone and is a step in the right direction as far as lead dress goes.
I have a few voltages right now and will get the rest very soon.
B+1-286.4
B+2-278.5
B+3-207.9
B+4- 181.1
B+5- 178
There still is NO head room in this amp guys! I don't know what I am doing wrong. It is still very dirty at 10:00. Once again ZERO head room.
I replaced all the tubes... same thing.
Let me get some more voltages and maybe we can further discuss what might be wrong. Until then here are some pictures for any obvious mistakes on my part.
I have finished re building my Rocket. I hope that this looks cleaner to everyone and is a step in the right direction as far as lead dress goes.
I have a few voltages right now and will get the rest very soon.
B+1-286.4
B+2-278.5
B+3-207.9
B+4- 181.1
B+5- 178
There still is NO head room in this amp guys! I don't know what I am doing wrong. It is still very dirty at 10:00. Once again ZERO head room.
I replaced all the tubes... same thing.
Let me get some more voltages and maybe we can further discuss what might be wrong. Until then here are some pictures for any obvious mistakes on my part.
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Voltage chart
Here we go
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Last edited by showsii on Thu Mar 17, 2011 4:29 am, edited 1 time in total.
Voltage chart
Your voltage readings look good, within tolerance I believe. Is your speaker in good shape and operating nicely on another amp? You are matching impedance. You swapped guitars and cables.
Ange
Ange
Re: Voltage chart
angelodp wrote:Your voltage readings look good, within tolerance I believe. Is your speaker in good shape and operating nicely on another amp? You are matching impedance. You swapped guitars and cables.
Ange
Speaker- yes
Impedance- yes
Guitars and cables- yes
Hmmmm what could it be?
Ian
Re: My first Rocket... Need help!
https://tubeamparchive.com/viewtopic.php?t=14188 more pictures
Would changing r7 from 56k to 68k help my cause any? or should this not matter in my situation?
Ian
Would changing r7 from 56k to 68k help my cause any? or should this not matter in my situation?
Ian
sound clip
Here is a clip
Volume- 10
Treble and bass- 12
Cut- 2
Volume- 10
Treble and bass- 12
Cut- 2
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Re: My first Rocket... Need help!
The spreadsheet with the expected voltages has the grids on the power tubes grayed out. Not sure if you actually measured the voltages on the power tube grids or just skipped it because those pins are grayed out on the sheet. If you haven't checked, you may want to see if you can measure any DC voltage - if so, caps might be leaking DC.
I had this problem on my Rocket which was built from a Ceriatone kit with the half power switch on the cathodes of the power tubes. I found that using the switch with while in play mode caused one of the caps to leak DC. Took me awhile to figure that out because all my voltages (except on the grids were very close to as expected. I ended up taking out the half power switch as I didnt' really like the half power mode anyway.
DC on the power tube grids killed the headroom and generally made the amp sound bad. After correcting, the amp had a great clean sound and a good bit of headoom.
Hope this helps.
Mike
I had this problem on my Rocket which was built from a Ceriatone kit with the half power switch on the cathodes of the power tubes. I found that using the switch with while in play mode caused one of the caps to leak DC. Took me awhile to figure that out because all my voltages (except on the grids were very close to as expected. I ended up taking out the half power switch as I didnt' really like the half power mode anyway.
DC on the power tube grids killed the headroom and generally made the amp sound bad. After correcting, the amp had a great clean sound and a good bit of headoom.
Hope this helps.
Mike
Re: My first Rocket... Need help!
sunnydaze wrote:The spreadsheet with the expected voltages has the grids on the power tubes grayed out. Not sure if you actually measured the voltages on the power tube grids or just skipped it because those pins are grayed out on the sheet. If you haven't checked, you may want to see if you can measure any DC voltage - if so, caps might be leaking DC.
I had this problem on my Rocket which was built from a Ceriatone kit with the half power switch on the cathodes of the power tubes. I found that using the switch with while in play mode caused one of the caps to leak DC. Took me awhile to figure that out because all my voltages (except on the grids were very close to as expected. I ended up taking out the half power switch as I didnt' really like the half power mode anyway.
DC on the power tube grids killed the headroom and generally made the amp sound bad. After correcting, the amp had a great clean sound and a good bit of headoom.
Hope this helps.
Mike
Mike,
Thanks for the help! I will measure the grids on the power tubes. I didn't at first because they were grayed out, (newbie mistake).
I am suppose to have 0v DC on the grids correct?
Thanks
Ian
Re: good info
Ok I measure the Grids of V4,5,6,7angelodp wrote:Mike, good info, I am gonna run in and check my half power switch. I gotta say I do not use it much anyway.
Ian you don't have a half power switch but you can check those voltages and see if you have leaky caps.
A
I get .18mv on 4,5
And .8mv on 6, 7
Does this mean I have leaky caps, or is this amount immaterial?
Ian