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#26 pre amp
#26 pre amp
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Old 25th May 2011, 10:55 PM   #1021
andyjevans is offline andyjevans  United Kingdom
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Just to add, the 8 way speakon is more expensive and rather big. I actually use it for the filaments of driver and output tubes in my amp, so the filaments can't be connected to the wrong supply - the 4 pole XLR is for the input stage. For the HT to my amp I use an Amphenol AP-4-22 connector - cheap and rated for 650v.

Andy
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Old 26th May 2011, 08:39 AM   #1022
merlin el mago is offline merlin el mago
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Thanks again guys.
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Old 30th May 2011, 03:20 PM   #1023
merlin el mago is offline merlin el mago
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Suitable Tx for AZ1 Mesh 4VAC 1.5A? could you suggest me link to buy?
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Old 30th May 2011, 06:31 PM   #1024
massimo is offline massimo  Italy
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For heaters? Very difficult to find one off the shelf.
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Old 30th May 2011, 06:39 PM   #1025
milen007 is offline milen007  Indonesia
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Quote:
Originally Posted by merlin el mago View Post
Suitable Tx for AZ1 Mesh 4VAC 1.5A? could you suggest me link to buy?
they have
Audio Catalog

erwin
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Old 30th May 2011, 06:54 PM   #1026
merlin el mago is offline merlin el mago
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Originally Posted by milen007 View Post
they have
Audio Catalog

erwin
I only see 2 x 3.75VAC 2A.can be enoug with one tx?
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Old 30th May 2011, 07:04 PM   #1027
milen007 is offline milen007  Indonesia
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016TF40int is that you need

connect the two 0-2v in series to get 4v
but email them to make sure that its 2 secondary of 0-2v
erwin
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Old 30th May 2011, 07:13 PM   #1028
merlin el mago is offline merlin el mago
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thank you erwin

cheers
felipe
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Old 31st May 2011, 07:40 AM   #1029
bequerel is offline bequerel  Norway
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It is probably easier to find a 5V or 6.3V transformer. Drop the voltage by means of resistors.
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Thanx!
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Old 1st June 2011, 07:50 PM   #1030
E.T. is offline E.T.  United States
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Quote:
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Erwin, what's the current rating on the chokes? This will tell you whether shared chokes between L & R channel is possible or not.

Choke-input constructed B+ is definitely recommended.

Well Quasi-choke input anyway. So CLCLC, but with first cap only 0.47uF to 1.5uF (high quality polypropylene, NOT motor-run plastic-housed type). The LCR components PC/HV/S is my favourite in this position.

LCR COMPONENTS|PC/HV/S/WF 470NF 1KV|CAPACITOR, 470NF, 1000V | Farnell United Kingdom

First L should be the 10H (provided this has the highest current rating, preferably 20 - 30mA.

With 20H in the second choke position (rated 10mA+ I hope!) you can used high quality capacitors, without high values.
Hi Rod,

I don't understand why the first cap should have such a low value. Is this to protect the rectifier tube?

With the PT I have, a choke input would drop the B+ voltage too far. I was assuming 40uF / choke / 40 / choke / 40 plus various bypass caps. How would I integrate a 0.47uF into that? Does the ground lug of the small-value cap still function as the star ground for high-current stuff?

Last edited by E.T.; 1st June 2011 at 07:53 PM. Reason: add question
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