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post #2431 of 9496

They still can handle as much current

 

GZ33 250 ma  or 300 ma with choke input

 

GZ37 250 ma or 350 ma with choke input

 

You can try this tube in the OTL amp

post #2432 of 9496

Thanks Glenn, I suppose that means the GZ33 always is that small compared to the GZ37

post #2433 of 9496

I own a GZ33 and GZ37. The are identical in size, shape and plates. And on my speaker system they sound (to my ear) the same. The GZ37 has less voltage drop than the GZ33, though.

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CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), quality = 75

post #2434 of 9496

I just found this chart on line:

 

 

Tube Type DC mA PIV FIL AMPS Max ACV DCV DCV DROP
Diode Rectifier         425  
5AR4 / GZ-34 250 1500 1.9 450 415 10
5V4-GA 175 1400 2 375 400 25
GZ37 350 1000 2.8 450 388 37
5U4-GA 250 1550 3 450 381 44
5U4-G 225 1550 3 450 381 44
5U4-GB 275 1550 3 450 375 50
5Y3-G/GA 125 1400 2 350 365 60
5R4GYB 250 3100 2 900 362 63
5R4G/GY/GYA 250 3100 2 750 358 67

 

From this is seems like one could use a GZ37 any time an amp called for a 5U4G, right?  I draws less current and has a nice high current available.

 

Am I translating these numbers correctly?

 

I also see that the GZ34 has a very low voltage drop.  Is that why it is a preferred rectifier?

 

There is so much to learn about this.  Very interesting stuff.  I wish I had learned more when I took electrical engineering in college.  I am not sure they got into this, though.

post #2435 of 9496

To piggyback on dminches's chart...

here's another chart on five-volt fullwave rectifiers.

Their specs are slightly different.

 


Edited by Clayton SF - 3/28/13 at 7:46am
post #2436 of 9496

Nice tables thanks.

 

5V3 is also a recommended tube.

post #2437 of 9496
Quote:
Originally Posted by Clayton SF View Post

To piggyback on dminches's chart...

here's another chart on five-volt fullwave rectifiers.

Their specs are slightly different.

 


That is one of the most useful charts I've ever seen, thanks for sharing it.

 

Just a small correction though, I believe it is the GZ33 that has less voltage drop compared to the GZ37.  It is sort of an underdog with the GZ37 being more popular and I'm not sure why because if you look at what people say about it most people slightly prefer the GZ33 when they've had the chance to compare.

 

edit:  I believe the GZ33 heater current is 3.0A against the GZ37's 2.8A so there is that small difference too.  Technically that makes the GZ33 closer to a true 5U4G equivalent I would say.


Edited by Xcalibur255 - 3/28/13 at 6:38pm
post #2438 of 9496

I am now curious what a 5AT4 looks like.  800mA current output....... the one rectifier to rule them all.

 

Coincidentally I've tried a number of the tubes on that list.  None of them sound as good as the 3DG4 does in the OTL.  I think the most interesting was the 5AW4, a most curious little tube.  I'm not sure if I would call it "good" but it certainly is interesting sounding and they look unique too.

 

I have to wonder if the chart is totally accurate though, why would the 5Z3 and 5U4G have different voltage drops?  Aside from their base pin out they are the exact same tube.

post #2439 of 9496
Quote:
Originally Posted by dminches View Post

           
             
             
             
             
             
             
             
             
             
             

 

From this is seems like one could use a GZ37 any time an amp called for a 5U4G, right?  I draws less current and has a nice high current available.

 

Am I translating these numbers correctly?

 

I also see that the GZ34 has a very low voltage drop.  Is that why it is a preferred rectifier?

 

There is so much to learn about this.  Very interesting stuff.  I wish I had learned more when I took electrical engineering in college.  I am not sure they got into this, though.

It won't let me remove the chart to shorten the quote.  tongue.gif

 

In basically all cases you can sub a GZ33 or GZ37 in an amp that wants a 5U4G.  The heater current is the same (or slightly lower in the GZ37) and the output ratings are higher.  The biggest danger in rolling rectifiers is not knowing what your transformer is capable of handing.  In a Woo amp for example their 5V tap can only go up to 3.0A.  So if you were to try the 5AU4 or another tube like that, and you could since it would go in the socket, it would take its toll on the transformer over time and burn it up quite possibly.

 

The OTL is good up to 5.0A so the whole field is fair game more or less so long as the rectifier can output enough current.  250mA is the minimum and it really should be 300mA or higher.
 

I can expand on the logic behind voltage drop on rectifiers if you want me to, up to my own understanding at least.  I think maybe I already did that once here a while ago actually.


Edited by Xcalibur255 - 3/28/13 at 6:43pm
post #2440 of 9496

Hey, y'all--here's the full chart and accompanying text.

Excellent read.

 

Five Volt Fullwave Rectifier Tubes
post #2441 of 9496

That is great.  Thanks Clayton.

post #2442 of 9496
Quote:
Originally Posted by Xcalibur255 View Post

 

I can expand on the logic behind voltage drop on rectifiers if you want me to, up to my own understanding at least.  I think maybe I already did that once here a while ago actually.

 

 

If you don't mind please do expand your thoughts.

Thanks

post #2443 of 9496

The voltage drop in a rectifier tube is according to the current drawn through the rectifier.

So the same tube will have a different voltage drop in different amps that draw different

amount of current.  So the same tube will sound different in different amps.

Back to eating Cadbury Creme Eggs

post #2444 of 9496
Quote:
Originally Posted by 2359glenn View Post

The voltage drop in a rectifier tube is according to the current drawn through the rectifier.

So the same tube will have a different voltage drop in different amps that draw different

amount of current.  So the same tube will sound different in different amps.

Back to eating Cadbury Creme Eggs

Whether it is a voltage drop or a sugar spike... Yes. I'm going to get some Cadbury Creme Eggs right now. rosgr63 made me do it. ;)

post #2445 of 9496
Quote:
Originally Posted by Clayton SF View Post

Whether it is a voltage drop or a sugar spike... Yes. I'm going to get some Cadbury Creme Eggs right now. rosgr63 made me do it. ;)

Were do you think I got them from?

The problem with Cadbury Creme Eggs is they are so good you can't stop eating them. 

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