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Anyone know of a source for miniature 7-pin tube bases? I'm looking for the type that has a way to solder components to the top side and has the pins to insert into a 7-pin miniature socket. I think I used to have a few of them but I think I let them get away and now am not finding them very available, if at all.

Thanks,
Barry - N4BUQ

I'm thinking the problem is with T3/ switch contacts/ associated components.? The switch is clean but will check rotor contact.? Then I'm thinking of pulling v8, leaving d14 disconnected and with radio powered down look for resonance pin 5 to ground at the LO -? about 5mhz.? Does this seem a reasonable thing to do?? v8 showing no cathode current (v drop across resistor) says its not oscillating correct ?? ? Thanks for any thoughts on this. -ron

Since all filtering is at 50KHz...? and 50KHz is nearly just high audio...
I wonder is an audio filter could be modified to work at 50KHz.? Inject it before the AVC and
it could be a modern rig...
73,
Gary
WB6OGD

I'll add that a larger tip with more thermal mass will get the job done quicker.

73

-Jim
NU0C

On Mon, 12 Apr 2021 21:30:32 -0500
"Jeffrey Angus" <jdangus@...> wrote:

On 4/12/21 7:42 PM, Paul Kraemer wrote:

Even fine wire and micro tip with the heat turned down I seem to
ruin three to get one good one made up.

You're doing it wrong. A HOT tip. Get on and off quickly.
Use RMA rosin flux in addition to the core flux.
And, personally, use 63/37 solder. 0.032"

Turn up the heat!

On 4/12/21 7:42 PM, Paul Kraemer wrote:

Even fine wire and micro tip with the heat turned down I seem to
ruin three to get one good one made up.

You're doing it wrong. A HOT tip. Get on and off quickly.
Use RMA rosin flux in addition to the core flux.
And, personally, use 63/37 solder. 0.032"


--
"I am a river to my people."
Jeff-1.0
WA6FWI
www.foxsmercantile.com

In line audio filters are a wonderful tool. I have two different DPS boxen that I regularly use that are frankly amazing. But you have to be aware of their limitations. They won't help with strong adjacent signals that are pumping your ACG or worse.

73

-Jm
NU0C

On Mon, 12 Apr 2021 09:31:12 -0700
"Brien Pepperdine" <busybrian@...> wrote:

Well, at risk of seeming an amalgamation of a classic snake oil salesman and revivalist 'tent meeting' speaker, I can personally attest for Dave Cripe's HiPerMite audio filter. It first appeared in 73 magazine, was revised and has been a 4Square QRP kit for some time now..... *
* I built mine and use it on many of my rigs as an external audio filter - on the R4C (even with its own filter), TR-4Cw (with and w.o its own filter), my R-390A etc. It is great. In fact, IMHO even though the one I built I did it as the zero-gain setup... I find that with my R-390A I don't have to have the RF and Audio gain pots nearly so high.. the filter seems to 'gain' the signal, FWIW, in an exemplary way. IMHO.
Additionally, my TR-7 has been put aside for now until I surrender the funds to buy a? new Noble CW filter to replace the Drake CW filters (which seem to have aged out and become hollow and ring-y in my hearing opinion... the HiPerMite made it work quite nice though).
Strongly recommended. I am not a salesman nor tent speaker and never have played one on TV nor radio..... :)
Brian VE3HI

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Group

I'm finding out tonight I haven't received any posts on the reflector since April 9, when I first posted my question about DIN connectors but I have now read those replies in "direct" mode after I posted again and then checked to see if it made it.? So far looks like I am not getting anything "from"

Joe and I are trying to fix it.

Paul K0UYA

Does anyone know of a good brand of these pesky connectors?? By good I mean NOT a plastic body that melts at the mere sight of a soldering iron?? I have soldered more than a few connections in my life but I really hate having to put one of these together.? Even fine wire and micro tip with the heat turned down I seem to ruin three to get one good one made up.? A PTFE body would be excellent but I haven't found them---yet.

Paul K0UYA

I've used Conny's DAFC on several TR7s since Cumbria closed. The DAFC works very well and comes assembled with the hardware to install it in the TR7.








73, Joe Pyles KC9LAD

At 02:29 PM 4/12/2021, you wrote:

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You may try Conny, DL1SDQ. He is THE German TR7 repair guy and - amongst other services - he has a stabilizer.

73 de Dieter DL5RDO

Sounds like the socket needs cleaning. Some DeOxit and a GUM Proxabrush
dental cleaning brush will do it.

Mike, W1NR

On page 13 of the following document, located on Ron, WB4HFN's web site list the 3 current stabilizers that are being sold. All work as well as another, although I've never personally had the Elcon version.?



73s,
Mark, WB0IQK

Well, at risk of seeming an amalgamation of a classic snake oil salesman and revivalist 'tent meeting' speaker, I can personally attest for Dave Cripe's HiPerMite audio filter. It first appeared in 73 magazine, was revised and has been a 4Square QRP kit for some time now.....
I built mine and use it on many of my rigs as an external audio filter - on the R4C (even with its own filter), TR-4Cw (with and w.o its own filter), my R-390A etc. It is great. In fact, IMHO even though the one I built I did it as the zero-gain setup... I find that with my R-390A I don't have to have the RF and Audio gain pots nearly so high.. the filter seems to 'gain' the signal, FWIW, in an exemplary way. IMHO.
Additionally, my TR-7 has been put aside for now until I surrender the funds to buy a? new Noble CW filter to replace the Drake CW filters (which seem to have aged out and become hollow and ring-y in my hearing opinion... the HiPerMite made it work quite nice though).
Strongly recommended. I am not a salesman nor tent speaker and never have played one on TV nor radio..... :)
Brian VE3HI

N4KZO de K8NN

Thanks Michael.? I had been thinking of that but in the other direction.? I managed to get the full alignment procedure done while all three were oscillating.

Would be good to go except the 20M xtal has gone intermittent again.? It seems to be something to do with the socket because if I wiggle it crackles and eventually I can get it to a place where it will stay and oscillate.? However, any vibration on the bench causes it to move minutely but enough to cause it to stop oscillating again.? Would like to reflow the solder joints on that portion of the crystal socket but it's hellish difficult to access and don't think its possible to get the soldering iron in there.? Moving the pins worked well on the 40 and 15M xtals and they seem firmly in place and are oscillating their little hearts out.

I've got a brand new 20M xtal inbound and will try that out and in the meantime see if I can poke around from the bottom and see if I can find anything intermittent there.

Other than that, it works great.? Going to stick a themistor in the AC line input just on general principles.? The receiver appears to be quite sensitive although it doesn't receive anything but the signal generator here in the basement.? Would like to get this one put to bed, put it on the market and move on to the other 2B I have that apparently has a hellishly loud parasitic oscillation that appears as soon as it's turned on.

Thanks again and I'll keep you advised.

NM0S has designed a narrow 200 CW filter that has no ringing. ?

The QRP Labs QCX QRP rigs use that design and I can attest to the effectiveness of that CW filter. One of my many projects is to build that filter for my R-4B.

The Four ?State QRP group sell a kit based on NM0S’s?design. ?See?

That CW filter is way better than the DSP ?one in my ICOM 746 PRO!


--

73, Bernie. VE3FWF

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