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| | |-+  Step by step BM HRM build...
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Author Topic: Step by step BM HRM build...  (Read 72348 times)
erwin_ve
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« Reply #15 on: May 27, 2009, 04:12:51 AM »

Hi Mcinku, You did that fairly quick! Looks very nice. Hope to hear some sounds of your new puppy!
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mcinku
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« Reply #16 on: May 27, 2009, 05:04:52 AM »

It took me a little over a week... I usually started to work in the evenings, after kids went to bed...around 3h per day... under 30 hours I would say.

I'll ask my tech if I can borrow his HRM (I hope he still has it)... so I can compare OTS, HRM and BM HRM... all 2x6L6 versions.
I'll try to set up my recording gear and try to capture that... should be very interesting... and useful for everybody considering one of this amps.


 Wink
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djroge1
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« Reply #17 on: May 27, 2009, 10:16:05 AM »

This has been helpful - thank you. I'm still uncertain about those heater wires, but that's just me. I know it's only 6.3v.
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mcinku
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« Reply #18 on: May 27, 2009, 04:04:12 PM »

It's alive.    Chair Dance


I took the amp to my amp tech for initial power up...
Here's me setting bias at around 33mV


* BM_HRM15.JPG (148.44 KB, 1024x768 - viewed 541 times.)
« Last Edit: May 28, 2009, 01:50:22 AM by mcinku » Logged

mcinku
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« Reply #19 on: May 27, 2009, 04:05:51 PM »

We measured around 40W of clean power...


* BM_HRM16.JPG (141.86 KB, 1024x768 - viewed 460 times.)
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mcinku
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« Reply #20 on: May 27, 2009, 04:08:27 PM »

These are my plate voltages...

V1a   196V
V1b   198V
V2a   193V
V2b   193V
PIa   255V
PIb   247V
6L6   471V

...and finally one happy picture for the end  Grin


* BM_HRM17.JPG (146.04 KB, 1024x768 - viewed 523 times.)
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hywelg
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« Reply #21 on: May 27, 2009, 04:34:53 PM »

Great, well done. Now don't forget to burn it in well.
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mcinku
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« Reply #22 on: May 27, 2009, 04:39:58 PM »

Sure thing
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pine
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« Reply #23 on: May 27, 2009, 06:12:52 PM »

Mcinku, that was a great contribution to this forum and you have all of our thanks, the plate voltages look great, I can't wait to hear it. beautiful job!
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mcinku
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« Reply #24 on: May 28, 2009, 02:02:43 AM »

You're welcome... I enjoyed this very much... I'm almost sorry it ended, not that I mind having a new amp  Grin
I played it yesterday... just a few minutes (didn't have time for anything more) but I can already say this amp is very much different from my Overtone... and I couldn't stop smiling while I was playing.
Can't say much more at this point.

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hywelg
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« Reply #25 on: May 28, 2009, 04:25:01 AM »

I played it yesterday... just a few minutes (didn't have time for anything more) but I can already say this amp is very much different from my Overtone... and I couldn't stop smiling while I was playing.
Can't say much more at this point.
 

Different how? C'mon don't keep us in suspense!
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mcinku
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« Reply #26 on: May 28, 2009, 04:43:12 AM »

Ok I'll say a few things but my opinion might change after I learn more about this amp.

This amp has a lot more bass and it's less middly ... FAT as HELL.
Has less overdrive compared to OTS and the character of it is very different. It sounds like a trumpet with a spongy feel to it.   Huh?  Sorry can't do better than that.  Grin
It sounds bigger, that's a fact...
That's all for now.

I didn't even play with the HRM yet... I just set everything to 12:00 and played
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m0b1liz3
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« Reply #27 on: May 28, 2009, 07:40:04 AM »

Thanks for these posts.  I am sure the photos will help me as I progress through my build (at about 1/10th your speed!)
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JUN42
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« Reply #28 on: May 28, 2009, 08:36:58 AM »

Congratulations mcinku !
Nice build and photos. This is very helpful for new builders.

I think that the last photo is the best ! Smiley

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mcinku
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« Reply #29 on: May 29, 2009, 05:50:39 AM »

Yesterday I was playing my new amp for a few hours together with OTS with G12-65... at band volumes

...we all know OTS is one hell of an amp but man, this BM is something else.
Compared to OTS it has less mids... more or different kind of bass... the notes just pop out on BM... sound more clear with better string definition. OTS sounds almost congested in the mids somehow. I know OTS sits well in a band mix, still have to try the BM but I think it will do just fine.
BM HRM is an awesome amp and I think it's going to take away no1 spot from the OTS.   Lips Sealed

I was sure I would never find even better amp than OTS... damn.

what else is out there... Sad

 Cool
« Last Edit: May 29, 2009, 07:25:19 AM by mcinku » Logged

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