MagneQuest/Peerless Forum Welcome! Need support, you got it. Or share your ideas and experiences.

---

[ Follow Ups ] Thread: [ Display  All  Email ] [ MagneQuest/Peerless Forum ]

---

[ Alert Moderator ]

---

Re: Simple 84

Posted by mqracing (M) on June 18, 2004 at 13:18:22

In Reply to: Simple 84 posted by Gordon Rankin on June 18, 2004 at 10:44:59:

Hi Gordon:

thanks for the Simple 84 schematic. I hope you don't mind a question or two.

:::If you have a cap coupled preamp make sure the cap is at least 4uF or above, tranny a better method.::::

Is the 4uf cap on the output of the preamp to prevent dc from getting to the EXO-173? And is the size is dictated (or necessary) to maintain bandwidth in the 173 down to some low freq level (example; 10hz)?

Could this cap be placed "in front" of the 173... if for example someone had a preamp but did not want to go inside it and change anything?

::::You could make this an integrated by subbing in a Transformer Vol control with +6dB of gain.::::

speaking of gain. won't this amp require some additional gain (i.e., an active preamp) or use of a TVC set up for gain?

If you went straight in with a cd output... say it was two volts and then the 173 steps up that voltage by a factor of two... you would only have four volts to drive the grid of the EL-84 and wouldn't get full output (would ya)?

And to keep costs down (plus I'm not sold on TVC's)... what if you had an additional (optional) gain stage in front of the EXO-173... say for guys with passive pre's or guys who would want to come off of their cd player output only (with perhaps a vol control on the amp side)....

Again... neat... it's been a long while since i've seen a really neat looking EL84 series fed SE circuit...

I remember at the first VSAC hearing the Sun Audio 6V6 SE amp... and preferring it sound wise to their 2A3 SE amp.

thanks again,

MSL

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

Parts Connexion

---

[ Top of Page ] [ Contact Us ] [ Support/Wish List ] [ Copyright © 2025, Audio Asylum, all rights reserved ]

---

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

---