davygrvy wrote:Hi Vince, No it isn't. But this is a shot of the backside of my modified rectifier. The fine folks at Antique Radio Supply got me my new parts rather quickly and just finished the soldering about an hour ago. The red wires just moved clockwise one tab. Diodes I chose were the 1N4007 types. I chose two in parallel because they are 1A rated and two would match the 1.9A rating of the 5AR4.
DC voltage at the first cap is now at 423V compared to 508V with the 5U4GB. Although the forward drop of a 5AR4 is less than a 5U4GB and would seem to have a higher output, the internal resistance is greater hence the lower voltage. Warm-up time is about 20 seconds which is greater than the warm-up time of the EL34s which is an excellent match.
6bg6ga wrote:You don't have to purchase 20 year old tubes for stability. The Sovtek 5AR4's work fine.
Geek wrote:6bg6ga wrote:You don't have to purchase 20 year old tubes for stability. The Sovtek 5AR4's work fine.
Yes, they do! Sovtek's are great.
As for diodes, I use MUR4100 in series and don't bother with the slower rectifiers that need bypass caps.
Cheers!
abhijit wrote:Hi, Thanx for your suggestion!! How one do without these diodes if it slows down!!
abhijit wrote:Hi, Thanx for your suggestion!! How one do without these diodes if it slows down!!
mantha3 wrote:I was reading a few different forums on the topic of running a pair 1N4007 diodes to a GZ34 Rectifier. This is done in the photo on this post.
I did the mod the other night.
I read one post where someone said with the 1N4007 diodes you'd be dealing with the problem of "Switching". The post advised using the UF4007 in place of the 1N4007 as mentioned in this post and in the photo. The person was talking about the benefit of the Ultra Fast Diode in place of the 1N4007.
I was thinking of re-doing the mod with the UF4007... Thoughts?
mantha3 wrote:I read one post where someone said with the 1N4007 diodes you'd be dealing with the problem of "Switching". The post advised using the UF4007 in place of the 1N4007 as mentioned in this post and in the photo. The person was talking about the benefit of the Ultra Fast Diode in place of the 1N4007.
I was thinking of re-doing the mod with the UF4007... Thoughts?
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