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Old 15th February 2012, 07:47 PM   #81
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Quote:
Originally Posted by regiregi22 View Post
Can someone please measure the total height from chassis to the top of the tallest valve? My estimation is that, if chassis is 3" tall, the distance from chassis to the top of the tallest valve should be around 4". An estimation made only by looking at the assembly pictures.

May someone put a rule for a second and give me a hand?
The height measurement for the completed amp is 8.5" from the table top to the top of the KT88s. If I remember correctly, I rounded off that measurement a little long. That is with the wood side panels and little rubber feet that come with the panels. The photo of the perforated cover certainly "looks" taller than 5.22" indicated on the engineering drawing. I'll take another accurate measurement when I'm at the office tomorrow and let you know.

Concerning exposed high-voltage. There are no exposed high voltages present on this amplifier. Yes, the tubes do get hot. That would be a concern if you have little folks around that might be tempted to touch the "pretty lights".

Scott
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Old 16th February 2012, 02:09 AM   #82
Dave R is offline Dave R  United States
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Not sure if you have materials available to make your own, or if you have tools available to fabricate something like a "bird cage", but here are a few ideas.

Here's a link to some decorative screen or mesh materials.
China Perforated Metals (Hole Shape) manufacturer & supplier - Anping Yilida Metal Mesh Co., Ltd.

My local hardware store stocks a few different styles to pick from. I've been thinking of making a cover out of it, mainly for aesthetics -- but also for the possible little ones who need to touch things that might be hot. I live alone and don't get many visitors, so it's been low on the priorities so far.
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Old 16th February 2012, 02:28 AM   #83
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I'm not sure that the Hammond offering could be modified to work with the side panels due to the the bracing details shown in the engineering drawings. Maybe. I will check the actual height as I said earlier, in case you don't want to use the side panels.

I agree with Dave, your local "home store" may offer solutions similar to the link provided by Dave. A little fabrication could yield a good alternative.

All of my tube amps are at my work location. I work with fine folks, but sometimes you've just got to wonder what might happen next.

Scott
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Old 16th February 2012, 09:09 AM   #84
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Quote:
Originally Posted by scitizen17 View Post
I'm not sure that the Hammond offering could be modified to work with the side panels due to the the bracing details shown in the engineering drawings. Maybe. I will check the actual height as I said earlier, in case you don't want to use the side panels.
I have already checked the measures and it is feasible to flip the lateral sides 90 degrees so to be horizontally screwed to the wood. I have made my calculations with Hammond datasheets and it seems to fit. Now I have to think a proper way to flip 90 the 9.53mm steel flap, in a not-very-messy way.
Hammond Mfg. - Perforated Chassis Covers (1451 Series)
P/N:1451-30

Another consideration is cost, Farnell charges me around 75 plus delivery for this part.

Quote:
Originally Posted by scitizen17 View Post
Concerning exposed high-voltage. There are no exposed high voltages present on this amplifier. Yes, the tubes do get hot. That would be a concern if you have little folks around that might be tempted to touch the "pretty lights"
Yeah, by exposed I mean a "meaningful risk of beating a valve, breaking the glass, thus touching the cathode".

Quote:
Originally Posted by scitizen17 View Post
All of my tube amps are at my work location. I work with fine folks, but sometimes you've just got to wonder what might happen next.
My approach use to be to always think of the worst case scenario. I don't have small childs around home, but I consider myself enought messy to have an accident.
I am confident enoght to beat, kick and throw away to the floor my SS designs, and be sure that, not only I will not get a shock, but they will be in a 100% operational state (ok, maybe external connectors may suffer damage).
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Old 18th February 2012, 11:26 AM   #85
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Quote:
Originally Posted by scitizen17 View Post
The height measurement for the completed amp is 8.5" from the table top to the top of the KT88s. If I remember correctly, I rounded off that measurement a little long. That is with the wood side panels and little rubber feet that come with the panels. The photo of the perforated cover certainly "looks" taller than 5.22" indicated on the engineering drawing. I'll take another accurate measurement when I'm at the office tomorrow and let you know.

Scott
Were you finally able to took this measurement?

Thanks
Regards
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Old 18th February 2012, 11:56 AM   #86
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Quote:
Originally Posted by regiregi22 View Post
Were you finally able to took this measurement?

Thanks
Regards
From tabletop to the top surface of the chassis is 3.25".
From the top surface of the chassis to the top of the KT88 (highest point) is 4.25".
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Old 18th February 2012, 04:06 PM   #87
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Thank you so much!
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Old 19th February 2012, 11:37 AM   #88
debk is offline debk  United States
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I just ordered the master kit, and am very much looking forward to building the amp.

A quick question. Has anyone tried using LEDs to bias the 6N1P. I would think a couple of red LEDs should work, like the HLMP-6000.

Be interested in hearing anyone thoughts or results if they tried it.

Debra
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Old 19th February 2012, 02:09 PM   #89
iNSuL is offline iNSuL  United States
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I have and it does have some positive results, I would recommend a higher voltage led though. I used the same ones and ended up with a lower bias voltage. Try to look for a 2 volt.

Jonathan
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Old 19th February 2012, 03:51 PM   #90
debk is offline debk  United States
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The HLMP-6000 have a Vf of 1.6V so two of them will give a 3.2V bias.

There are a couple of others in the HLMP-6xxx series that could work.

HLMP-6400 have a Vf of 2.0V these are yellow LEDs
HLMP-6820 have a Vf of 2.1V these are green LEDs

I just happen to have a number of the red HLMP-6000 from other projects lying around.

The max forward current is lower for these HLMP-6400 20ma and the HLMP-6820 30ma (the HLMP-6000 is rated at 50ma).

I think either of these will still have enough safety margin?

Let me know if my thinking is correct

Debra
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