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I’d go as far as to say that holds true for 95% of the OEM speakers. The Heathkit SB604 wasn’t much to write home about either Mike WB8VGE The Heathkitshop

IMO, the MS4 speaker has to be the worse speaker I have owned.? ?With the AC4 power supply installed in it, it doesn't leave much wiggle room for open cell foam and dynamat.? Replacing the driver

I took the easy way out on my yaesu xcvrs.......and used an external rack mount? Class A headphone amp. ( 200 mw per channel).? Simple Behringer 4 x channel Class A? headphone amp.? ?I use

Very true Jim. I am trying to confirm the VCO is off that far. [email protected]> wrote:

Did you alter the feedback network to roll off above the speech range? May of the reference designs built around these are for hi-fi bandwidth. "Bob Loving via groups.io"

Those are some strange readings you are seeing on your counter. Per the service manual the high VCO should free run at around 32 MHz. Operating range is 63.05 to 78.05 MHz. "Jim Harris via groups.io"

Yes Gary that does interest me a lot. We will talk about that and make a deal I hope. Many thanks for the offer. Jim VE1RB [email protected]> wrote:

Thank you for that info! You are 100% right about the MS-4 in stock form (its fidelity is pitiful though). I am more of an SWL type person, which is what motivated me to make changes to the MS-4. A

Thank you, Paul, for the extended explanation. Bob K9JU

You know, the VCO board in the TR7 is the same as the one in the R7. I happen to have a working R7 VCO board if this interests you. Gary W0DVN

Okay I will get it out and have a look see. Jim VE1RB [email protected]> wrote:

Well, your 30 MHz scope is not entirely useless. Even though the ~80 MHz VCO will be severely attenuated, you should still be able to see it and determine what it looks like That VCO signal is pretty

The network also helps to stabilize the amplifier from oscillating when switching loads between speaker and headphones -- especially if there’s an open circuit condition at any moment between

Gary the frequency counter is hook to 5/24. I will check the input to the two 5 volt regulators and let you know. I do have a scope but it only goes to 30 mhz but I know where I can get a good 100 MHz

Many years ago, I designed a PC board for the TDA 2003 Audio Amplifier. Like some have noted, the hiss level was/is a bit too high if you listen when wearing "cans."? The spec sheet has the device

If that oscillator is showing anything real (~152 MHz) then it is being selected. This selection is enacted by the application of +10 volts on U502. The VCO board has no other information about the

Hi Joseph, Initially I duplicated the low frequency roll-off of the stock amp, but later changed the input roll-off to be minimal. I see a typo in the attached schematic. The output coupling

Gary I tried that ground on RFC505 and no change. Is it not getting band information? Jim VE1RB [email protected]> wrote:

Okay Gary I will go do that right now. Jim VE1RB [email protected]> wrote:

On Wed, Jan 1, 2025 at 12:52?PM Jim Harris <radiove1rb@...> wrote: > Good ideas Jim and I will get at doing that today. It is windy and raining > here quite hard. A good job inside hi hi. I