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Hi Floyd, Thanks for pointing that out. I’ll look at the board in my R-4C and see which is correct. It likely doesn’t make much difference with the inverting input impedance. Rob, NC0B Sent:

Well, there ya go! Nice catch. Doesn't it feel good? That is an interesting failure. Just a wild guess but I am thinking the lead had a weak spot, maybe a nick or a spot of corrosion, that caused it

Thank you to all and to Rob especially. This is all very helpful - all gold. Nigel [email protected]> wrote:

Tweak the cxr osc....such that the low end rolls off the same on LSB? as it does on USB.? ?That's as good as it will get.

The computed -3 dB high-pass turnover frequency is 123 Hz for 330 uF, and 204 Hz for 200 uF.? Pick either one based on personal roll-off preference. Paul, W9AC

Rob - maybe it makes no difference at all, but there is a discrepancy in the component values for the AMP-4.? The text specifies the inverting input capacitor as 200 uF while the schematic shows it

I just wanted to let you know I managed to get the high VCO working. I was removing transistors and checking them on my tester, and when I removed Q504 and noticed that the Gate lead was broken off

At a guess the smaller magnet was Alnico 5 or some other metallic magnet material while the larger one was ceramic. Ceramic magnets are very powerful but do not conduct magnetism well so tend to be

40m cw at night in a big contest is a good time to rediscover the rf gain. :) John k5mo

It is not just hiss that is an issue. The wide range speaker will faithfully reproduce any out of band distortion products present in the audio. "Steve Wedge, W1ES/4 via groups.io"

I did not roll of the high frequencies in the TDA2003 Audio Power Amplifier. The low-level audio stages were completely redesigned as the Drake system really sucked! Bob K9JU

Well, it actually does make a signal more listenable by reducing the noise floor. "Steve Wedge, W1ES/4 via groups.io" <w1es@...> wrote:

Agree Gary....I have never set bias by turning "all controls to the left". Just make sure the GAIN pot at ZERO....CCW. Seems to have always worked in the past for me. Good hunch about possible 10m

Over the course of MS4 production, Drake used at least two different speaker driver variations. One has a large magnet, roughly the size of the SSN replacement being discussed. I've seen two minor

I used this speaker from Surplus Sales years ago in a 312B-4. Fit and sounded fine. No, I’ve not yet used one in an MS-4 but it should just drop in. Dan WB4GRA

If there is a difference (there should NOT be), it probably indicates the need for neutralization.? 10meters is where the final can most easily break into oscillation if not neutralized properly (and

I have an original speaker from either a Collins console or an MS-4, not sure which. The cone has no tears. It sounds good, as it should. No “Whizzer” cone, thankfully. $25 plus shipping. Gary

It's called the audio$fool effect. [email protected]> wrote:

Oh, shoot! I meant to add that in. The joys of using a phone without a real keyboard... Very important if you're buying these tubes from someone who doesn't know about this (and it's the main reason

So Dan the Collins is a direct replacement for the Drake? Frank Krozel KG9H Life Member, ARRL (630) 924-1600 kg9hfrank@...