Re: Power tube for Rectifier ...


"Jim" <jim@xxxxxxxxxxxxxxxxxxxxxx> wrote in message
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Phil S. wrote:
"- Endro -" <endro_wicaksono@xxxxxxxxx> wrote in message
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Well.. I burned an EZ80 rectifier tube on my mod Old 53?s Radio Tube
that has El84 Single-Ended Class A configuration. Initially, it just
being used the ?phono? section for power amp and using my H+K Tube20
preamp to feeds in the front.

The PT provides around 350 VAC for rectification and the heater around
5 VAC, since the rectifier tube was burned out, then I use 4 amp diode
rectifiers to make it working.

Lately found that in many news group and forum that some late amp, for
example ?68 Ampeg B-25, being found with 6L6 and some others with 5881
in rectifier position.

Based on more curiosity, lately founds out that that could be make
some sort of Half-Wave Rectification, but still could be able to feeds
smoothing 50 uF Filter Caps, but little bit longer time delay, makes
more sag/compress sound in the end.

Then tried that on initial my Tube Radio, put EL84 on rectifier
position.. it works..!!
Voltage drops at 230-250 VDC on EL84 plate power tube position, but
notices more compress sound compare with diode...

Interesting..!! This Rectifier tube replacement with Power tube..
since hard & almost impossible to find EZ80 replacement in my place/
country?

Maybe the scenario also works for 5AS4 or so with the same pin power
tube position (6L6/5881), even just being Half?Rectification (as Half-
Wave rectifier)..


======================
Easier to rig up 2 diodes and be done with it.

Might be too high of a plate voltage when going from tube rectifier to
solid state.

OK so there is other sand you can use to deal with that problem. All of it
relatively cheap stuff and shouldn't be too hard to get in Eastern Europe.
All that is preferable to the oddball thing that was done, IMO.


.

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