HRO-60 C-65
 

Hello

I now have one HRO-60, which I have wanted since I did not have $800 in
1965, and it has one part that can cause fatal damage.

It is a dual 40 mfd electrolitic between one of the power transformer
windings and ground, and the power transformer is made of unobtanium.

I am quite certain that modern solid capacitors will never short out. Does
anyone put them into a can that is about 1.4 inches in diameter and 3
inches high? The can of course is not critical, but that is about the size
of the space available.

Any ideas will be gratefully considered.

Jim


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HRO-60 C-65
 

Antique Electronic Supply sells them.

Darrell, WA5VGO



It is a dual 40 mfd electrolitic between one of the power transformer
windings and ground, and the power transformer is made of unobtanium.

HRO-60 C-65
 

Jim, Not knowing if you are one of the purists (and this is meant with
absolutely no malice), or not, might I suggest that you simply add a
hay-rake terminal strip to the bottom of the chassis, near/at where the
electrolytic is mounted and use a couple of readily available tubular
electrolytics. The chassis top will look original and only you will
know the horrible truth, below deck...!!! Via experience with my '60T,
you may find that some of the paper caps are bad also. Its my personal
position that one's gear should work properly and via the use of
whatever appropriate components are required and available. Having said
the above, check with Antique Electronic Supply (AZ). They often have
NIB multi-section caps in stock.
de Jeep/K3HVG



Jim DeClercq wrote:
Hello

I now have one HRO-60, which I have wanted since I did not have $800 in
1965, and it has one part that can cause fatal damage.

It is a dual 40 mfd electrolitic between one of the power transformer
windings and ground, and the power transformer is made of unobtanium.

I am quite certain that modern solid capacitors will never short out. Does
anyone put them into a can that is about 1.4 inches in diameter and 3
inches high? The can of course is not critical, but that is about the size
of the space available.

Any ideas will be gratefully considered.

Jim

HRO-60 C-65
 

Thank you. I had forgotten all about them, after buying some nuvistors for
a Techtronic scope. Will certainly look into this.

de K8JUM

K3HVG writes:

: Jim, Not knowing if you are one of the purists (and this is meant with
: absolutely no malice), or not, might I suggest that you simply add a
: hay-rake terminal strip to the bottom of the chassis, near/at where the
: electrolytic is mounted and use a couple of readily available tubular
: electrolytics. The chassis top will look original and only you will
: know the horrible truth, below deck...!!! Via experience with my '60T,
: you may find that some of the paper caps are bad also. Its my personal
: position that one's gear should work properly and via the use of
: whatever appropriate components are required and available. Having said
: the above, check with Antique Electronic Supply (AZ). They often have
: NIB multi-section caps in stock.
: de Jeep/K3HVG



: Jim DeClercq wrote:
: Hello
:
: I now have one HRO-60, which I have wanted since I did not have $800 in
: 1965, and it has one part that can cause fatal damage.
:
: It is a dual 40 mfd electrolitic between one of the power transformer
: windings and ground, and the power transformer is made of unobtanium.
:
: I am quite certain that modern solid capacitors will never short out. Does
: anyone put them into a can that is about 1.4 inches in diameter and 3
: inches high? The can of course is not critical, but that is about the size
: of the space available.
:
: Any ideas will be gratefully considered.
:
: Jim
:
:


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HRO-60 C-65
 

Jim DeClercq wrote:
Hello

I now have one HRO-60, which I have wanted since I did not have $800 in
1965, and it has one part that can cause fatal damage.

It is a dual 40 mfd electrolitic between one of the power transformer
windings and ground, and the power transformer is made of unobtanium.

===============================
Jim:

The part that will kill your power transformer is C-118, the 0.1 uF
capacitor connected from one side of the high-voltage winding to
ground. When it shorts, your power transformer is history. C-118 has
killed more power transformers in more HRO-60s than shorted filter
capacitors. The line fuse will not protect your transformer. By the
time it blows, the transformer is gone.

My advise it to remove C-118 and do not replace it at all -- it is not
needed.

--Ed

HRO-60 C-65
 

And thank you too. Have manual, found it, agree that is does not seem to
do anything. I will excise it and find out for sure, but still its
function is unknown, and other such have resistors in series. See C-59'

Jim

Ed Engelken writes:


: Jim DeClercq wrote:
: Hello
:
: I now have one HRO-60, which I have wanted since I did not have $800 in
: 1965, and it has one part that can cause fatal damage.
:
: It is a dual 40 mfd electrolitic between one of the power transformer
: windings and ground, and the power transformer is made of unobtanium.
:
: ===============================
: Jim:

: The part that will kill your power transformer is C-118, the 0.1 uF
: capacitor connected from one side of the high-voltage winding to
: ground. When it shorts, your power transformer is history. C-118 has
: killed more power transformers in more HRO-60s than shorted filter
: capacitors. The line fuse will not protect your transformer. By the
: time it blows, the transformer is gone.

: My advise it to remove C-118 and do not replace it at all -- it is not
: needed.

: --Ed


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HRO-60 C-65
 

Well C118 is supposedly to filter transients.
You could of course repace it with a ceramic or mylar cap.



"Ed Engelken" wrote in message
oups.com...

Jim DeClercq wrote:
Hello

I now have one HRO-60, which I have wanted since I did not have $800 in
1965, and it has one part that can cause fatal damage.

It is a dual 40 mfd electrolitic between one of the power transformer
windings and ground, and the power transformer is made of unobtanium.

===============================
Jim:

The part that will kill your power transformer is C-118, the 0.1 uF
capacitor connected from one side of the high-voltage winding to
ground. When it shorts, your power transformer is history. C-118 has
killed more power transformers in more HRO-60s than shorted filter
capacitors. The line fuse will not protect your transformer. By the
time it blows, the transformer is gone.

My advise it to remove C-118 and do not replace it at all -- it is not
needed.

--Ed