HRP Series

M Fowler · Post by **M Fowler** » Wed Sep 14, 2011 1:56 am

I am in the middle of a Stephen Darkbluemurder #39 build using MC Marshall 100w OT and Heyboer 100w PT.

Sorry about the poor photos. I need to punch 50/50 can cap holes yet.

Mark

M Fowler · Post by **M Fowler** » Wed Sep 14, 2011 2:15 am

For more information this is a good thread below:

https://tubeamparchive.com/viewtopic.ph ... sc&start=0

Bob S · Post by **Bob S** » Wed Sep 14, 2011 3:36 am

Hmm... I have 100W Marshall iron & a big chassis/cab I've been wondering what to do with. This might be it.
Thanks Mark.

Tone Lover · Post by **Tone Lover** » Wed Sep 14, 2011 7:31 am

Cool looks good

tubeswell · Post by **tubeswell** » Wed Sep 14, 2011 8:06 am

Big iron Mark!

azatplayer · Post by **azatplayer** » Wed Sep 14, 2011 10:19 am

Such a big chassis and such a little board! Youre not over-compensating for something Fowler?

M Fowler · Post by **M Fowler** » Wed Sep 14, 2011 12:11 pm

Thanks guys.

Don, its a matter of not designing like some of you guys do such a good job with. Small board big iron love it. I know the components are suppose to be airy for better performance. Well I could start over.

The PT is from a Heyboer order a few of us TAG members had going for Dumble builds, but does that look like it would work with a CE Dumble chassis.

Since it was a freebee I decided to use it on this project.

Next Marshall build will be JCM800 channel and a hot rod channel foot switching set-up. Like a Splawn QR or Nitro.

Mark

surfsup · Post by **surfsup** » Wed Sep 14, 2011 12:39 pm

I'm watching closely Mark. Nice layout btw...

here's mine though I got "derailed" for a while pondering output tubes and impedances...

surfsup · Post by **surfsup** » Wed Sep 14, 2011 1:26 pm

Mark, what's that little tranny for? Are you running DC heaters?

Post by **Colossal** » Wed Sep 14, 2011 2:57 pm

surfsup wrote:Mark, what's that little tranny for? Are you running DC heaters?

I think that's a choke.

Weathered · Post by **Weathered** » Wed Sep 14, 2011 3:14 pm

Looks good Mark - I love the aluminum faceplate.

M Fowler · Post by **M Fowler** » Wed Sep 14, 2011 4:37 pm

Surfsup, that is your nice layout as you well know

I like your eyelet board but I was lazy and had my press set-up for turrets so went that way.

Yes that is a Marshall style choke sir.

That faceplate is BNP Lazer designed by Colossal, a great guy

Mark

surfsup · Post by **surfsup** » Wed Sep 14, 2011 6:17 pm

Thanks for the props. I see you weren't too fond of the PS layout board oh well. I'm still going to use it I think it will work well though I shoulda put the two big Rs to ground on the caps. but now if the cap is under the board, its all accessible on the board so its a give or take.

I'm going to dive into this again soon. I think i am going to order a whole new set of PT/OT for a difference chassis using the lower W output PA I plan to use.

Markusv · Post by **Markusv** » Wed Sep 14, 2011 8:04 pm

Mark

Could you please comment on your use of the red PRP resistors throughout?
Any insights as to sound coloration or lack thereof?

Markus V

M Fowler · Post by **M Fowler** » Wed Sep 14, 2011 8:24 pm

Markusv,

Mark, could you please comment on your use of the red PRP resistors throughout?
Any insights as to sound coloration or lack thereof?

That is Surfups board your looking at. I will have to let him answer your question

Mark

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