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Oh no...not another Baby Huey EL84 build.
Oh no...not another Baby Huey EL84 build.
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Old 25th May 2020, 09:56 AM   #141
eldarvanyar is offline eldarvanyar  United Kingdom
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Hi Bas,
Donít mean to stalk you

Can you give the measurements of your case please including height, depth , width in metric cm or mm?

Could you also say what size holes you had to drill for the valves / tubes?

Anything else that would be good to know it is relevant would be appreciated?

It will help me thinking about either building or sourcing a case?

What type of top plate have you used? Steel, aluminium etc

Thanks again

Lee
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Old 25th May 2020, 10:26 AM   #142
Bas Horneman is offline Bas Horneman  Netherlands
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Topplate aluminium.

Width 35cm*30cm*11cm (But as usual I would have preferred a bigger cabinet. I was quite nervous about the proximity of the power transformer to the output transformers.) So go bigger if you can.

I drilled them bigger after I found out the alignment was not exact...and I could not fit them. Unfortunately I did determine the holes when the pcb was still unsoldered too. Think the holes were 28mm. But that is trivial. Just don't drill them much bigger so that a kid can't stick his fingers in.

A relevant tip is that when your pcb is still unsoldered to...to determine where to drill the holes.
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Old 25th May 2020, 11:27 AM   #143
eldarvanyar is offline eldarvanyar  United Kingdom
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Thanks Bas, really appreciate your generosity of time and sharing your knowledge and experience

Lee
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Old 25th May 2020, 12:00 PM   #144
Bas Horneman is offline Bas Horneman  Netherlands
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You are welcome.

Just a correction.
Quote:
Unfortunately I did determine the holes when the pcb was still unsoldered too.
Should be when I had already soldered the board.
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Old 26th May 2020, 12:07 PM   #145
Francois G is offline Francois G  United States
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Quote:
Originally Posted by Bas Horneman View Post
You are welcome.

Just a correction.

Should be when I had already soldered the board.
Sorry, Bas, your ďcorrectionĒ confused me a bit. I thought you wanted to suggest that one should mark the top plate holes, using the PCB, before soldering parts to the PCBs. Is that correct?

I am also curious if you have tweeked R13 yet. I believe you installed 33k and were going to listen how it performs as you lower that resistance by adding parallel resistance to R16.
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Old 26th May 2020, 12:26 PM   #146
Bas Horneman is offline Bas Horneman  Netherlands
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Quote:
Sorry, Bas, your “correction” confused me a bit. I thought you wanted to suggest that one should mark the top plate holes, using the PCB, before soldering parts to the PCBs. Is that correct?
Yes. That is correct!

Quote:
I am also curious if you have tweeked R13 yet. I believe you installed 33k and were going to listen how it performs as you lower that resistance by adding parallel resistance to R16.
No. I was lazy. And added another 33k. So now the value is 16.5k. I'm just going to leave it there and not tweak it...
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Old 27th May 2020, 10:24 PM   #147
eldarvanyar is offline eldarvanyar  United Kingdom
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Hi Baz,

I am thinking I will end up with the Toroidy PSU and OPTs

If I were to use a choke would this one from Toroidy be suitable 10H 500ma

Click the image to open in full size.

TDS10/500 - Toroidal Choke 10H 500mA DC - Shop Toroidy.pl

Technical data
Core type toroidal
Inductance L 10H
DC Resistance 66,5Ω
Nominal DC Current 500mA
Nominal voltage 400V
Dimensions 88 mm (OD) x 61 mm (h), weight: 1,9 kg
Dimensions SUPREME 129 mm (OD) x 80 mm (h), weight: 3,6 kg

Thanks again

Lee
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Old 28th May 2020, 03:56 AM   #148
Francois G is offline Francois G  United States
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Quote:
Originally Posted by eldarvanyar View Post
Hi Baz,

I am thinking I will end up with the Toroidy PSU and OPTs

If I were to use a choke would this one from Toroidy be suitable 10H 500ma
That would be overkill. Marc specified a much smaller choke, I forgot the exact specs, but it was something like 1.5H at 200 ma. (Have you checked the “real Baby Huey EL84” thread? Long but lots of good stuff).

No harm in using the 10H 500 ma choke, but it is just more than needed. For a Baby Huey EL84 stereo amp you will need around 200ma and based on Toroidy’s offerings I would go for: TDS10/250 - Toroidal Choke 10H 250mA, since their smallest (6H) is only a few Zloties less. However, if you plan to rebuild a EL34/KT88 later on, perhaps an investment in the 500 ma current capable choke could be justifiable.
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Old 28th May 2020, 09:21 AM   #149
Bas Horneman is offline Bas Horneman  Netherlands
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I agree with Francois about the overkill. Especially about the 500mA. Plus what exactly did you order? 2 BH boards? And no psu board? In that case you need two chokes. 1 per channel.

TDS12/200 - Dławik Toroidalny 12H 200mA DC - Sklep Toroidy.pl looks good. Or any other 200mA.
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Last edited by Bas Horneman; 28th May 2020 at 09:33 AM.
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Old 28th May 2020, 10:22 AM   #150
eldarvanyar is offline eldarvanyar  United Kingdom
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Hi Bas I have ordered two BH EL84 boards from Prasi and one psu board. I have been wondering about ordering another psu board. Itís going to take a long time to get here due to COVID-19.

I would like to take advantage of using the 6N2P -EV and 6P14P-EV as well as
12ax7 and EL84 configurations by installing toggle switches if that is viable.

I already have an EL34PP and and a KT88 amp which is why I am keen on building the BH EL84 amp.

The choke I enquired about came up automatically on the Toroidy website when I was looking at the EL84 PP OTs.

The Dutch guy never replied - I sent two emails one in Englishman one with google translate. I have been reading up on EI Transformers, C Core Transformers and The C transformers looked really good. I

I have been ready through the Long BH EL84 thread but it seems that there have been different versions along the way and itís all getting a bit confusing.

I think if there was a main DIY build thread that just showed the process similar to Spaceistheplace has done for the EAR 834P Phono Clone it would really help novices like myself.

https://www.lencoheaven.net/forum/in...?topic=26658.0

Thanks again

Lee
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