Forums :: Resources :: Features :: Photo Gallery :: Vintage Radio Shows :: Archives
Support This Site: Contributors :: Advertise


It is currently Jul Tue 23, 2019 1:30 am


All times are UTC [ DST ]





Post New Topic Post Reply  [ 46 posts ]  Go to page Previous  1, 2, 3
Author Message
 Post subject: Re: Question on subbing a 60FX5 for a 50C5.
PostPosted: Dec Fri 19, 2014 4:51 am 
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 13830
35Z5 wrote:
After two NOS 35Z5 failures in approx 24 months(9 & 14mo), and three well used that lasted maybe 12 months total, I stuck a 45Z5 in the little Admiral daily player that's only turned off maybe five or six hours a day(and sometimes never)... After approx six months, if there's any difference in performance I can't tell it, even warm up occurs within what would be considered a normal amount of time...

I'll update in a year or so...

Tom


Well I need to update on that little Admiral far sooner than I thought...

Looks like the 45Z5 shorted which burned the plate supply and resistor in the filter cap network off it's cathode(of course could be intermittent filter cap, those no doubt have over 15K hours)...

Made a nice loud hum shortly after turn on and smoke poofed out the back... Naturally when I opened it up it played fine, so not being in the mood to replace the resistors, 45Z5 and filter caps plus 50L6 for good measure, I set it on the shelf and put one of my Warco radios into daily duty...

Tom


Top
 Profile  
 
 Post subject: Re: Question on subbing a 60FX5 for a 50C5.
PostPosted: Dec Sun 21, 2014 11:25 pm 
Member

Joined: Sep Thu 23, 2010 6:37 am
Posts: 11422
Location: Powell River BC Canada
You could lose the 35W4 to a 1N400x, and add a Candohm with a 160 ohm , 5
watt, section plus the 1.2 K 3 watt 60FX5 heater shunt.

_________________
de
VE7ASO VE7ZSO
Amateur Radio Literacy Club. May we help you read better.
Steve Dow
ve7aso@rac.ca


Top
 Profile  
 
 Post subject: Re: Question on subbing a 60FX5 for a 50C5.
PostPosted: Dec Sun 21, 2014 11:48 pm 
Moderator
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 22904
Location: Somers, CT
You could leave the rectifier tube filament for the desired voltage drop, and still sub a silicon diode for the rectifier.

_________________
Just because it can be done doesn't mean it should be done.


Top
 Profile  
 
 Post subject: Re: Question on subbing a 60FX5 for a 50C5.
PostPosted: Dec Wed 24, 2014 5:33 pm 
Member

Joined: Jun Thu 30, 2011 9:03 pm
Posts: 280
Location: Pennsville, NJ 08070
Follow up on my experiment that started this whole discussion...I found a 25DK4 rectifier tube that is (and I found performs) identical to a 35W4 except for ten volts lower heater current. So if there was any lingering concerns about pushing the heater string ten volts lower than originally designed, now I have the set running with the original total: 25 + 60 + 12 +12 +12 = 121.




Joe


Top
 Profile  
 
 Post subject: Re: Question on subbing a 60FX5 for a 50C5.
PostPosted: Jun Sun 16, 2019 3:32 pm 
Member

Joined: Jun Thu 30, 2011 9:03 pm
Posts: 280
Location: Pennsville, NJ 08070
Reviving an old thread to report on the health of the 60FX5 I had tried out in place of a 50C5. Been four and a half years regular use and the tube along with the others in the set continue to work fine with regular use. I ultimately ended up pairingthe 60FX5 with a 6AQ6 (which is essentially a 12AT6 with a 150 ma 6 volt heater) to split the difference on the series string between staying exactly the same or lowering the heater voltages a small amount, less than a volt per tube when the added four volts are shared across all five tubes.

I’m listening to Frank Sinatra as I type and everything continues to sound good.


Top
 Profile  
 
 Post subject: Re: Question on subbing a 60FX5 for a 50C5.
PostPosted: Jun Fri 21, 2019 1:08 am 
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 13830
Thanks for report, glad it worked out.

I'm all for subbing unknowns just to be doing so.

_________________
Tom


Top
 Profile  
 
Post New Topic Post Reply  [ 46 posts ]  Go to page Previous  1, 2, 3

All times are UTC [ DST ]


Who is online

Users browsing this forum: No registered users and 6 guests



Search for:
Jump to:  


























Privacy Policy :: Powered by phpBB