Tubes Asylum Questions about tubes and gear that glows. FAQ

---

[ Follow Ups ] [ Post Followup ] Thread: [ Display  All  Email ] [ Tubes Asylum ]

---

[ Alert Moderator ]

---

RE: Can I use a 5R4GY in an amp made for 5U4G/5U4GB/U52 ?

Posted by Tre' (P) on June 15, 2014 at 07:44:40

In Reply to: Can I use a 5R4GY in an amp made for 5U4G/5U4GB/U52 ? posted by Frihed89 on June 15, 2014 at 05:21:09:

You can but it will lower the B+.

Duncan PUSDII can tell you what the difference will be.

You will need to know what the B+ is now and the total idle B+ current draw. Also the AC voltage of the HT winding of the power transformer and it's DCR and all the values of the parts in the B+ filter (caps, chokes etc.).

If this is your own design and you are willing to make other adjustments, it could be "better" but if this is not your design and you are simply going to change the rectifier tube you will change the design and probably not for the better.

Edit: I always think in terms of a critical choke input power supply filter because that's the proper way to build a power supply. As Eli pointed out the 5r4 will not take as big of a first cap in a cap input filter supply. You could end up just burning the whole thing down.

If you're willing (and able) to re-design the whole power supply so that it's safe for the 5r4 then you can use a 5r4, otherwise don't do it.

Tre'

Have Fun and Enjoy the Music
"Still Working the Problem"

Edits: 06/15/14

This post is made possible by the generous support of people like you and our sponsors:

Signature Sound

[ Signature Sound Lounge ]

---

[ Top of Page ] [ Contact Us ] [ Support/Wish List ] [ Copyright © 2024, Audio Asylum, all rights reserved ]

---

[ General ] [ Speakers ] [ Tubes ] [ Vinyl ] [ Digital ] [ Hi-Rez ] [ Video Asylum ] [ Cables ] [ Tweaks/DIY ] [ Music ] [ Films ]

---