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Wanted: 6V4 rectifier
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Return to top of page · Post #: 1 · Written at 4:42:58 PM on 5 September 2016.
	GBR Location: Gladstone, QLD Member since 15 May 2016 Member #: 1925 Postcount: 34
Does anyone have a functional 6V4 rectifier tube laying around? I have finally finished my amplifier project only to find that the 6V4 seems faulty. Regards Gary

Return to top of page · Post #: 2 · Written at 8:56:50 PM on 5 September 2016.
	Tallar Carl Location: Latham, ACT Member since 21 February 2015 Member #: 1705 Postcount: 2174
6v4 or 6v3 ?

Return to top of page · Post #: 3 · Written at 9:08:30 PM on 5 September 2016.
	Marcc Location: Wangaratta, VIC Member since 21 February 2009 Member #: 438 Postcount: 5389
6V3 is a single diode TV damper diode. What leads you to the conclusion? Its not always the valve. Marc

Return to top of page · Post #: 4 · Written at 9:35:20 PM on 5 September 2016.
	GBR Location: Gladstone, QLD Member since 15 May 2016 Member #: 1925 Postcount: 34
Its a 6V4. It is from a Kriesler 11-98 I believe. I only had the tubes and the transformers from it. I have approx 250 to 260v from my power transformer going to anodes pins 1 and 7. Output measured between ground and cathode pin 3 is less than 1 volt. Heater looks to be working.

Return to top of page · Post #: 5 · Written at 10:52:56 PM on 5 September 2016.
	Tallar Carl Location: Latham, ACT Member since 21 February 2015 Member #: 1705 Postcount: 2174
I believe I have a few 6V4s at home but I'm not there till 7 am can you send me a email and I will reply yes or no.

Return to top of page · Post #: 6 · Written at 5:37:23 PM on 6 September 2016.
	Johnny Location: Hobart, TAS Member since 31 July 2016 Member #: 1959 Postcount: 563
More likely to be a short on the HT line. JJ

Return to top of page · Post #: 7 · Written at 6:00:15 PM on 6 September 2016.
	GTC Location: Sydney, NSW Member since 28 January 2011 Member #: 823 Postcount: 6761
A short on the HT line, often caused by a bad filter electrolytic, will give the power transformer a hard time. Definitely check for shorts!

Return to top of page · Post #: 8 · Written at 10:00:58 PM on 6 September 2016.
	GBR Location: Gladstone, QLD Member since 15 May 2016 Member #: 1925 Postcount: 34
Ended up being a multimeter that had decided not to function in DC mode any longer. New meter, pin 3 of rectifier reading over 300v now.

Return to top of page · Post #: 9 · Written at 5:17:15 PM on 7 September 2016.
	Ian Robertson Location: Belrose, NSW Member since 31 December 2015 Member #: 1844 Postcount: 2476
Depending on how much power you need, if it's a stereo or push-pull amp the little 6V4 might be a bit stretched. Consider the larger, drop-in replacement 6CA4.

Return to top of page · Post #: 10 · Written at 5:26:25 PM on 7 September 2016.
	Marcc Location: Wangaratta, VIC Member since 21 February 2009 Member #: 438 Postcount: 5389
Do be cautious with modern equipment, it was in many cases not designed for valve radio. Often you need trade meters for the job. There are Digital meters that will not be able to handle 1kV and some cannot handle mixed input like RF riding on DC. The RF with some may actually cause a flash over internally. I have serviced a few older meters where caps have let go; Even a "Peak" 200H from the late 60's, with a failed cap on the output measuring plug. Marc

Return to top of page · Post #: 11 · Written at 5:49:54 PM on 7 September 2016.
	Johnny Location: Hobart, TAS Member since 31 July 2016 Member #: 1959 Postcount: 563
The Peak 200H was the first meter I brought, around 1963. Oh what memories . I still have it, except the rotary switch is long totally worn out. JJ

Return to top of page · Post #: 12 · Written at 6:06:26 PM on 7 September 2016.
	Brad Administrator Location: Naremburn, NSW Member since 15 November 2005 Member #: 1 Postcount: 7395
There are Digital meters that will not be able to handle 1kV I'd say most don't. Most meters, even the base model Fluke meters (which are the best meters money can buy) will go up to 600 volts. For 1kV you have to invest in a high end model. ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾ A valve a day keeps the transistor away...

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