|
Gentleman:
For a TR-4C, is there any difference between 6JB6A brands? I'm
buying 3 of them and there's some well known brands available such
as Sylvania, GE and RCA. RCA a bit cheaper. All NIB/NOS.
Any recommendations?
73
Marcus PY2PLL + PY3CRX
GG66rf
|
I would stay with one brand. Do not mix.? RcA also sells a longer version of the tube that will not fit so make sure you are getting the shorter version.
David Assaf III
W5XU??? VP8RXU
Gentleman:
For a TR-4C, is there any difference between 6JB6A brands? I'm
buying 3 of them and there's some well known brands available such
as Sylvania, GE and RCA. RCA a bit cheaper. All NIB/NOS.
Any recommendations?
73
Marcus PY2PLL + PY3CRX
GG66rf
|
From my experience, stick to GE or Sylvania.? Do not mix brands unless you can spot the differences in the internal frame.? There are two or three different frame types.
Steve Wedge, W1ES
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Monday, May 26th, 2025 at 1:26 PM, David via groups.io <david.w5xu@...> wrote:
I would stay with one brand. Do not mix. RcA also sells a longer version of the tube that will not fit so make sure you are getting the shorter version.
David Assaf III
W5XU VP8RXU
Gentleman:
For a TR-4C, is there any difference between 6JB6A brands? I'm
buying 3 of them and there's some well known brands available such
as Sylvania, GE and RCA. RCA a bit cheaper. All NIB/NOS.
Any recommendations?
73
Marcus PY2PLL + PY3CRX
GG66rf
|
Hi David:
Yes, they're will not be mixed. All from the same brand, but not
matched (from RF Parts). Interesting that on RCA tube description
they say:? "For Horizontal-Deflection-Amplifier. For use in Drake
Equipment.". May be ok on "T4" but not on TR(x)? U$35. But they
have GE as well (U$39).
73
Marcus PY2PLL
Em 26/05/2025 14:26, David via
groups.io escreveu:
toggle quoted message
Show quoted text
I would stay with one brand. Do not mix.? RcA also sells a
longer version of the tube that will not fit so make sure you
are getting the shorter version.
David Assaf III
W5XU??? VP8RXU
Gentleman:
For a TR-4C, is there any difference between 6JB6A brands?
I'm buying 3 of them and there's some well known brands
available such as Sylvania, GE and RCA. RCA a bit cheaper.
All NIB/NOS.
Any recommendations?
73
Marcus PY2PLL + PY3CRX
GG66rf
|
Hi Steve;
Yes, will be all the same brand but not a matched trio. But all
NOS. I guess GE is a good option too.
73
Marcus PY2PLL
Em 26/05/2025 15:17, Steve Wedge,
W1ES/4 via groups.io escreveu:
toggle quoted message
Show quoted text
From
my experience, stick to GE or Sylvania.? Do not mix brands
unless you can spot the differences in the internal frame.?
There are two or three different frame types.
Steve Wedge, W1ES
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Monday, May 26th, 2025 at 1:26
PM, David via groups.io <david.w5xu@...>
wrote:
I would stay with one brand. Do not mix. RcA also sells
a longer version of the tube that will not fit so make
sure you are getting the shorter version.
David Assaf III
W5XU VP8RXU
Gentleman:
For a TR-4C, is there any difference between 6JB6A
brands? I'm buying 3 of them and there's some well
known brands available such as Sylvania, GE and RCA.
RCA a bit cheaper. All NIB/NOS.
Any recommendations?
73
Marcus PY2PLL + PY3CRX
GG66rf
|
The tube was first made for TV use ? The shorter envelope was first and all other brands copied that.? ?It was later that the long tube came out.? Note the tube was invented for TV use not drake radio use.? ?I learned of the longer version the hard way when I put new tubes in a TR4.? The plate caps were just over the edge of the cage and shorted out.?? Good luck and hope you stay with the drake line forever.? I have about 35 pieces in varying stages of use.
David Assaf III
W5XU??? VP8RXU
Hi David:
Yes, they're will not be mixed. All from the same brand, but not
matched (from RF Parts). Interesting that on RCA tube description
they say:? "For Horizontal-Deflection-Amplifier. For use in Drake
Equipment.". May be ok on "T4" but not on TR(x)? U$35. But they
have GE as well (U$39).
73
Marcus PY2PLL
Em 26/05/2025 14:26, David via
escreveu:
I would stay with one brand. Do not mix.? RcA also sells a
longer version of the tube that will not fit so make sure you
are getting the shorter version.
David Assaf III
W5XU??? VP8RXU
Gentleman:
For a TR-4C, is there any difference between 6JB6A brands?
I'm buying 3 of them and there's some well known brands
available such as Sylvania, GE and RCA. RCA a bit cheaper.
All NIB/NOS.
Any recommendations?
73
Marcus PY2PLL + PY3CRX
GG66rf
|
Yes this tubes was designed for TV sweep
circuits, so 6JS6, 6KD6, PL509 etc and fortunately can serve as RF
pwr amps.
I'm already retired and after 50 years of license finally I was
able to get a functional TR-4C. I never forget the fascination
this rig create at a 14 yo boy when he (me) visited a local ham
shack back then and this guy literally cloned a TR-4C. He gave me
a hand made diagram, chassis drawing etc but It was too much for
me. I barely was able to assemble a 6DQ6 choke modulated AM TX.
51 years in the future and the "sound of a Drake receiver" still
in the memory. And then I got this one last year. And a month ago
a second one with RV-4C, untouched internally, noise blanker on
place, only the finals are a bit tired and C145 needed to be
restored as some of the power supply elet as well (all originals).
Thanks for the tips.
73
Marcus PY2PLL
Em 27/05/2025 09:22, David via
groups.io escreveu:
toggle quoted message
Show quoted text
The tube was first made for TV use
? The shorter envelope was first and all other
brands copied that.? ?It was later that the long tube came
out.? Note the tube was invented for TV use not drake radio
use.? ?I learned of the longer version the hard way when I put
new tubes in a TR4.? The plate caps were just over the edge of
the cage and shorted out.??
Good luck and hope you stay with the drake line
forever.? I have about 35 pieces in varying stages of use.
David Assaf III
W5XU??? VP8RXU
Hi David:
Yes, they're will not be mixed. All from the same brand,
but not matched (from RF Parts). Interesting that on RCA
tube description they say:? "For
Horizontal-Deflection-Amplifier. For use in Drake
Equipment.". May be ok on "T4" but not on TR(x)? U$35. But
they have GE as well (U$39).
73
Marcus PY2PLL
Em 26/05/2025 14:26, David via escreveu:
I would stay with one brand. Do not mix.? RcA also
sells a longer version of the tube that will not fit
so make sure you are getting the shorter version.
David Assaf III
W5XU??? VP8RXU
Gentleman:
For a TR-4C, is there any difference between 6JB6A
brands? I'm buying 3 of them and there's some well
known brands available such as Sylvania, GE and
RCA. RCA a bit cheaper. All NIB/NOS.
Any recommendations?
73
Marcus PY2PLL + PY3CRX
GG66rf
|
Any one of the three are good.? I have heard that RCAs in a trio (TR3/4) may need additional capacitance in the neutralising cap.
They really don't need to be matched.? All of the parts used in the PA circuit are 10% (resistors) and 20% (capacitors); I am not sure what the tolerance is for the chokes.? I have used same-brand tubes in lots of Drake transmitters that were not matched and they have worked fine.? Yes, you can precisely match them and all of the components of the PA and have ideal conditions but, in practical terms, it's very much a diminishing return for time and money spent.
73,
Steve Wedge, W1ES
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Tuesday, May 27th, 2025 at 7:41 AM, Marcus PY2PLL <py2pll@...> wrote:
Hi Steve;
Yes, will be all the same brand but not a matched trio. But all
NOS. I guess GE is a good option too.
73
Marcus PY2PLL
Em 26/05/2025 15:17, Steve Wedge,
W1ES/4 via groups.io escreveu:
From
my experience, stick to GE or Sylvania. Do not mix brands
unless you can spot the differences in the internal frame.
There are two or three different frame types.
Steve Wedge, W1ES
Time flies like an arrow. Fruit flies like a banana.
Sent with secure email.
On Monday, May 26th, 2025 at 1:26
PM, David via groups.io <david.w5xu@...>
wrote:
I would stay with one brand. Do not mix. RcA also sells
a longer version of the tube that will not fit so make
sure you are getting the shorter version.
David Assaf III
W5XU VP8RXU
Gentleman:
For a TR-4C, is there any difference between 6JB6A
brands? I'm buying 3 of them and there's some well
known brands available such as Sylvania, GE and RCA.
RCA a bit cheaper. All NIB/NOS.
Any recommendations?
73
Marcus PY2PLL + PY3CRX
GG66rf
|
Wes ...
I heard that thing about neutralization x RCA, and this was the
main reason I asked here about brands. PP5MS from Hamplus arise
this "neutralization issue" not on Drake rigs but at some Yaesus.
Ok about matching. I'll not buy matched trios anyway. As you said,
there are all those PA components tolerances involved so ...
Thanks for the tips.
73
Marcus PY2PLL
Em 27/05/2025 09:59, Steve Wedge,
W1ES/4 via groups.io escreveu:
toggle quoted message
Show quoted text
Any
one of the three are good.? I have heard that RCAs in a trio
(TR3/4) may need additional capacitance in the neutralising cap.
They
really don't need to be matched.? All of the parts used in the
PA circuit are 10% (resistors) and 20% (capacitors); I am not
sure what the tolerance is for the chokes.? I have used
same-brand tubes in lots of Drake transmitters that were not
matched and they have worked fine.? Yes, you can precisely match
them and all of the components of the PA and have ideal
conditions but, in practical terms, it's very much a diminishing
return for time and money spent.
73,
Steve Wedge, W1ES
Time flies like an arrow.? Fruit flies like a banana.
Sent with secure email.
On Tuesday, May 27th, 2025 at 7:41
AM, Marcus PY2PLL <py2pll@...> wrote:
Hi Steve;
Yes, will be all the same brand but not a matched trio. But
all NOS. I guess GE is a good option too.
73
Marcus PY2PLL
Em 26/05/2025 15:17, Steve Wedge,
W1ES/4 via groups.io escreveu:
From
my experience, stick to GE or Sylvania. Do not mix brands
unless you can spot the differences in the internal frame.
There are two or three different frame types.
Steve Wedge, W1ES
Time flies like an arrow. Fruit flies like a
banana.
Sent with
secure email.
On Monday, May 26th, 2025 at
1:26 PM, David via groups.io <david.w5xu@...>
wrote:
I would stay with one brand. Do not mix. RcA also
sells a longer version of the tube that will not fit
so make sure you are getting the shorter version.
David Assaf III
W5XU VP8RXU
Gentleman:
For a TR-4C, is there any difference between
6JB6A brands? I'm buying 3 of them and there's
some well known brands available such as
Sylvania, GE and RCA. RCA a bit cheaper. All
NIB/NOS.
Any recommendations?
73
Marcus PY2PLL + PY3CRX
GG66rf
|
Marcus PY2PLL
David