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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's Gravatar
 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's avatar
 Location: Latham, ACT
 Member since 21 February 2015
 Member #: 1705
 Postcount: 2149

6v4 or 6v3 ?


 
 Return to top of page · Post #: 3 · Written at 9:08:30 PM on 5 September 2016.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 5239

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's Gravatar
 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's avatar
 Location: Latham, ACT
 Member since 21 February 2015
 Member #: 1705
 Postcount: 2149

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's avatar
 Location: Hobart, TAS
 Member since 31 July 2016
 Member #: 1959
 Postcount: 543

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's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6678

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's Gravatar
 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. Smile


 
 Return to top of page · Post #: 9 · Written at 5:17:15 PM on 7 September 2016.
Ian Robertson's Gravatar
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 2363

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's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 5239

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's avatar
 Location: Hobart, TAS
 Member since 31 July 2016
 Member #: 1959
 Postcount: 543

The Peak 200H was the first meter I brought, around 1963.
Oh what memories Smile.
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's avatar
 Administrator
 Location: Naremburn, NSW
 Member since 15 November 2005
 Member #: 1
 Postcount: 7290

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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