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PostPosted: 16 Oct 2017, 11:59 
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Joined: 29 Jun 2016, 15:59
Posts: 41
Hi.

I decided to build the Oddblock monoblocks from scratch and would appreciate some help in selecting parts (I am not an experienced DIY). I have figured-out most of the parts, except for:

1) For the 0.1uf bypass capacitors across the B+ electrolytics in the power supply, I plan to use Polypropylene. Mouser does not show "audio grade" types. But has "AC and Pulse Film Capacitor", "General Film Capacitor", "Safety Film Capacitor", etc. I guess that I can use any of these. But, some of these state "not across the line" applications. Does this apply in this case? Or do I avoid them?

2) Can the same type of caps be used for the 0.1uf ones across the heaters?

3) The PS shows a DPST power switch. I assume that there is a reason for this (I would have used a SPST). I guess both poles would be connected to the Hot wire?

4) For the line filter unit, any of these 2 would do? The second one is twice as expensive and has more filtering:
Part # 3EHG1-2:
http://www.mouser.com/ProductDetail/TE- ... 9mnFXsw%3d

part # 3EGG8C-2:
http://www.mouser.com/ProductDetail/TE- ... 2fG0Fbk%3d

Any help is appreciated and sorry if these questions are too simplistic. Thanks.

Danny


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PostPosted: 16 Oct 2017, 16:46 
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Joined: 08 Aug 2009, 03:11
Posts: 2225
Location: Chilliwack, BC
Howdy!

Danny wrote:
1) For the 0.1uf bypass capacitors across the B+ electrolytics in the power supply, I plan to use Polypropylene. Mouser does not show "audio grade" types. But has "AC and Pulse Film Capacitor", "General Film Capacitor", "Safety Film Capacitor", etc. I guess that I can use any of these. But, some of these state "not across the line" applications. Does this apply in this case? Or do I avoid them?


Bruce should be here shortly to take care of the questions, but this one is easy.

Not all film caps are meant for greater than 120Hz. "AC and Pulse" mean high delta-V/delta-T (meaning good dielectric characteristics). Equivalent of Digikey's "High Frequency" film selection.

Not across the line simply means the dielectric can't cope with the constant AC P-P values and line spikes. That's where you need X1 or 2, Y1 or 2 ratings. Unless it's the noise surpressor across the on/off switch, no worries mate!

The position of the caps you speak of just need low inductance and good HF characteristics. PSU service can use polyester OR polypropylene, with the latter being preferred.

Modern electrolytics, especially SMPS duty ones, are good to several hundred KHz. If you can't get those caps across the PSU 'lytics for whatever reason, ignore them for now and just get 'er going (frankly, I've never used them unless the design calls for them... like voltage multipliers where high-ripple and low-Z-over-wide-range aren't happening at the same time)

Quote:
2) Can the same type of caps be used for the 0.1uf ones across the heaters?


Yes. We're talking low voltage and minimal spikes here.

Cheers!

_________________
-= Gregg =-
* Ratings are for transistors - tubes have guidelines*
Home: GeeK ZonE
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PostPosted: 16 Oct 2017, 17:38 
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Joined: 06 Oct 2015, 22:05
Posts: 11
It would be great if you could document your build here. These amps have interested me for quite some time.


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PostPosted: 18 Oct 2017, 11:00 
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Joined: 29 Jun 2016, 15:59
Posts: 41
invaderzim,

You can find info on the Oddblocks on the "Oddwatt Push Pull Tube Amplifier Projects" forum:

viewtopic.php?f=9&t=43


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PostPosted: 20 Oct 2017, 21:22 
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Joined: 04 Jun 2008, 20:59
Posts: 3748
Location: Arizona, USA
Hi, Sorry for the delay. I'm on the road at the moment. For audio grade capacitors I like to use Jantzen cross caps as filters. Parts Express has them and they are quite inexpensive. Others that are good are WIMA, Solen and Panasonic.

Good listening
Bruce

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