Need a solid state rec. suggestion

[pbman1953]

One of my Sunn's has Weber copper caps and my other has tubes in the rectifier area. I'd like to try a solid state this time. My amp tech said to look for one with the highest "PIV"

Does anyone have a suggestion?

Thanks

[sluckey]

Just get four 1N5408s. Put two in series for each HT lead. That'll give a safe rating of 2000V_PIV and 3A. B+ will increase. Hope the filter caps are rated for it.

[kagliostro]

Some types of Weber SS rectifier has an incorporated (SAG) resistor

I think it will be easy to you to verify if your's has a resistor and the relative resistance

so you can duplicate the circuit by yourself using the 1N5408 diodes

K

[pbman1953]

There are 4- 1000 uf caps rated at 350v

[pbman1953]

I saw that Tube depot same units in a plug in at $10. I may go with that. This way everything stays on the stock side

http://store.tubedepot.com/ssr.html?vfsku=ssr.2&gpla=pla&gclid=CN3r_sy4tLkCFQyk4AodWEoAfQ

the link shows the internal parts and connections

[sluckey]

There are 4- 1000 uf caps rated at 350v

Wow! Those are some biggggg caps. Those are likely to really strain a tube rectifier if not outright kill it.

[sluckey]

I saw that Tube depot same units in a plug in at $10.

I highly recommend you don't put that unit in those Sunns. The tube depot unit with only two diodes is only rated at 1000V_PIV. Those Sunns will exceed that PIV rating. That's why I suggested to use four diodes. You can bust the glass from an old octal tube and mount four diodes in the base if you want a cheap plugin module. Even fill the base with epoxy if you like.

[pbman1953]

so you're saying that I can duplicate the The Tube Depot one but with twice the parts

[smackoj]

I say plus 1000 for SL's right-on opin and sugg. do the 4 diodes for a cost of 1.20 or less. your tech should be easily able to put 'em in there.

It's not so much 2x the parts as it is installing something that gives a safety cushion for the rest of your amp. You're already doing the work so put the right parts in 'er.

SL....love the epoxy idea.....i gotta try that m'self.   

[pbman1953]

That diagram, from TD, was a top view right?

[pbman1953]

Also, while I have you guys, I need to install a speaker selector 4/8 ohm switch.


What value should the switch be?


Thanks for all the help!!!

[sluckey]

That diagram, from TD, was a top view right?

Yes. But the important thing is to connect the diodes to the correct pins. Pins 4, 6, and 8 are the ones you want.

I need to install a speaker selector 4/8 ohm switch. What value should the switch be?

Get the switch that Doug stocks. It's up to the task for big amps.

[pbman1953]

Awesome , Thanks

[SILVERGUN]

Here's an adjusted pic....it's not to scale, but at least it'll keep you on the right track

[pbman1953]

After looking at the amp, I could do it inside the chasis. It doesn't look like a big deal

Thanks

[pbman1953]

There are 4- 1000 uf caps rated at 350v

Wow! Those are some biggggg caps. Those are likely to really strain a tube rectifier if not outright kill it.

Interesting you say that. years ago , when I bought the amp, it already had the caps installed. The amp has been noisy due to tube socket wear. I figured to test the tubes while it was out of the cab  and now one of my Mullard's is dead. I have one good one. After poking around I see that they are big money prompting the going the SS route

[sluckey]

There are 4- 1000 uf caps rated at 350v

Are you sure they are one thousand µF? Two pairs of series connected one hundred µF would be more likely in a tube amp.

[pbman1953]

Busted!

You're right 100 uf

[kagliostro]

My previous post was in reference to this Weber solution

https://taweber.powweb.com/store/modkits.htm#SSRT



---

About the 100uF are they in series two by two with resistors in parallel ?



if so the result would be a pair of 50uF 700v caps

---

Doug rotary impedance switch





K

[pbman1953]

 

About the 100uF are they in series two by two with resistors in parallel ?

Yes


Will probably go for a high volt toggle, but I already have an on-off-on but I'd rather a on-on.


Thanks

[pbman1953]

I'm at a parts supply store and they do not have the 5408. Are they any other values that I can use?

[pbman1953]

Actually I'm all set. The store guys went on their  vendor site and cross referenced and found that they do have them. Grabbed 4