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January 24, 2022, 02:39:27 PM

Author Topic: B6 voltage too high on Paraglow II PSU update  (Read 1866 times)

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Offline kgwrocks

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Re: B6 voltage too high on Paraglow II PSU update
« Reply #15 on: May 17, 2020, 06:31:16 PM »
Wow! Shows what I know. Thank you for explaining clearly.
Do you have a part number for the 300r0/5W resistor? Is there anything else I should replace (as long as I am ordering parts)?

Could this have something to do with my original issue?
My guess is that the resistor got too hot and took the shunt reg with it. I will check if the Arcol resistors died.

Offline Paul Birkeland

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Re: B6 voltage too high on Paraglow II PSU update
« Reply #16 on: May 18, 2020, 05:07:31 AM »
This should work nicely for you:
https://www.mouser.com/ProductDetail/Vishay-Draloric/AC05000003000JAC00?qs=sGAEpiMZZMsPqMdJzcrNwnDHAJTsQNMje3pExDIkwVo%3D

For what it is worth, I have worked on a bunch of Paraglows over the years, and I've never had one come in with both of those driver boards still functioning, that's why I end up just replacing them.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline kgwrocks

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Re: B6 voltage too high on Paraglow II PSU update
« Reply #17 on: May 18, 2020, 06:06:53 AM »
Do you have info/parts for the soft start circuit? Sounds more convenient than my ground lift switches.

Offline Paul Birkeland

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Re: B6 voltage too high on Paraglow II PSU update
« Reply #18 on: May 18, 2020, 07:04:45 AM »
You can get a good chunk of the parts you'd need from our Smash-up upgrade.  Beyond what's in that kit, you'd need a few extra small parts to replace a few of the resistors in the kit, as well as a few extra parts if you want to implement the adjustable biasing feature that we added. 
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline Doc B.

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Re: B6 voltage too high on Paraglow II PSU update
« Reply #19 on: May 18, 2020, 07:53:43 AM »
JTs early shunt reg boards had a potential issue in that they would blow if the trimpot was turned all the way to the low end. Pretty sure that he would preset them close to where they needed to be when he packed those kits in order to avoid the issue.
Dan "Doc B." Schmalle
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Offline kgwrocks

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Re: B6 voltage too high on Paraglow II PSU update
« Reply #20 on: May 18, 2020, 08:28:43 AM »
Thanks for all of the help. So I will order the "smash" kit. What else do I need (e.g., resistors)?

Offline kgwrocks

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Re: B6 voltage too high on Paraglow II PSU update
« Reply #21 on: May 18, 2020, 08:31:32 AM »
Just took a quick look at the smash kit. Does this replace JT's boards? And is the kit for both monoblocks?

Offline Paul Birkeland

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Re: B6 voltage too high on Paraglow II PSU update
« Reply #22 on: May 18, 2020, 08:38:57 AM »
Are you going to keep the 5965? 

On the Smash-up schematic:

37R4 R1 becomes 90.9R
44K/4W becomes 330K/3W (Vishay PR-03)
49R9 R1 becomes 177R
100K R2 becomes 300K/3W (Vishay PR-03)
147K R4 becomes 330K/3W (Vishay PR-03)
0.1uF/400V Cc becomes 0.1uF/630V

Add one 33K 1/4W resistor to Y+/Y- on B side
Add one 10,000uF/6.3V cap to Y+/Y- on B side
Add one 300K/2W resistor between OB and -Reg

To add bias adjustments, you would populate a TL431, 4.99K resistor, and 10K trim pot on the unused regulator section of the Smash-up.

The new board wires in like the Tucker board, but you don't need that resistor between the power supply and the board, just connect it directly to the high voltage supply. 

You'll have to work off the schematic of the Smash-up and the tube datasheets to get it wired in. 

-PB
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline kgwrocks

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Re: B6 voltage too high on Paraglow II PSU update
« Reply #23 on: May 18, 2020, 08:50:29 AM »
My amps currently have 6N1Ps from JT's original upgrade.
Does the smash come with different tubes?

Offline kgwrocks

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Re: B6 voltage too high on Paraglow II PSU update
« Reply #24 on: May 18, 2020, 08:58:48 AM »
Question on this: "The new board wires in like the Tucker board, but you don't need that resistor between the power supply and the board, just connect it directly to the high voltage supply."

is that the 15k0/5W that goes from B+2 to B6?

Offline Paul Birkeland

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Re: B6 voltage too high on Paraglow II PSU update
« Reply #25 on: May 18, 2020, 10:54:55 AM »
You'd need to go back to 5965s. The Smash-up would come with a 6SN7 you don't need, but they do sometimes come in handy ;)

Yes, the 15/5W resistor goes away. 
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline kgwrocks

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Re: B6 voltage too high on Paraglow II PSU update
« Reply #26 on: May 18, 2020, 10:59:13 AM »
are the values you gave me for the 5965?

Offline kgwrocks

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Re: B6 voltage too high on Paraglow II PSU update
« Reply #27 on: May 18, 2020, 11:23:32 AM »
and what power rating on the other resistors?

Offline Paul Birkeland

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Re: B6 voltage too high on Paraglow II PSU update
« Reply #28 on: May 18, 2020, 02:48:20 PM »
That is what I would use for 5665s.  To be totally honest, this kind of work can be unforgiving of any mistakes, and is certainly something I could pop in for you if you sent these in for repairs. 

Otherwise, there's no manual for this.  If you asked nicely (and ultimately order the Smash-up upgrade to use for parts), Doc B. may be OK with me sending you the Paramount soft start retrofit manual.  That would be about 90% of the instructions you would need, though it's for a slightly different amp with a 5670 and not a 5965. 
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline kgwrocks

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Re: B6 voltage too high on Paraglow II PSU update
« Reply #29 on: May 18, 2020, 02:58:11 PM »
I ordered the smash.
What if I do all of the other upgrades and have you install the smash?
I doubt that Doc has mailed it to me yet.