|
|
|
|
|||||||
| Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
 |
|
|
Thread Tools |
7th Jan 2022, 4:27 pm
|
#21 | |
|
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,535
|
Re: Heathkit HW8 toroid wire
Quote:
 Iron, perhaps?
__________________
....__________ ....|____||__|__\_____ .=.| _---\__|__|_---_|. .........O..Chris....O |
|
|
|
8th Jan 2022, 2:43 pm
|
#22 |
|
Triode
Join Date: Aug 2020
Location: Folkestone, Kent, UK.
Posts: 21
|
Re: Heathkit HW8 toroid wire
Hi All
A question for you, I was thinking of starting anew thread, but as it was brought up here, I thought as well to continue It’s regarding my new toy, a Marconi Tf2700, Iv just had a close encounter with it, and on inspection I noticed the electrolytic caps installed, a few DO NOT match in value as stated in manual, ie 1mfd 350v in manual, but in meter a 1mfd 50v has been fitted? There’s a few others with large voltage differences Would I be best to replace All caps to specified values n voltages stated in manual? My gut feeling I should for piece of mind Apologies if I’m a pain! But hear to learn from you guys! Cheers Mark |
|
|
|
8th Jan 2022, 2:56 pm
|
#23 | |
|
Guest
Posts: n/a
|
Re: Heathkit HW8 toroid wire
Quote:
|
|
|
8th Jan 2022, 2:57 pm
|
#24 |
|
Octode
Join Date: Jun 2004
Location: Reading/Fakenham, UK.
Posts: 1,323
|
Re: Heathkit HW8 toroid wire
Sometimes voltages and capacitances get changed due to component supply without any significant change in performances. Sometimes it's just misprints in the manual.
I've certainly seen this in vintage manufacturers' radio service sheets that often get carried through to the Trader Sheets without correction. My Heathkit HW-9 transceiver also has a whole list of circuit corrections to capacitor values that look much more like misprint corrections than circuit updates. Unfortunately test equipment and their manuals are probably no more immune to this than any other equipment. Ian Last edited by Ian - G4JQT; 8th Jan 2022 at 3:05 pm. |
|
|
|
8th Jan 2022, 3:18 pm
|
#25 |
|
Triode
Join Date: Aug 2020
Location: Folkestone, Kent, UK.
Posts: 21
|
Re: Heathkit HW8 toroid wire
Cheers Ian, that makes sense, think it might be try one see what happens, and if that doesn’t work fit another!
I will hang on awhile and see if anyone has renovated a set before, and come up with some values that work! ect C11 & C2 are the misfits, suggestions please Thanks Mark Last edited by Endckr111; 8th Jan 2022 at 3:24 pm. |
|
|
|
8th Jan 2022, 3:53 pm
|
#26 | ||
|
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,535
|
Re: Heathkit HW8 toroid wire
Quote:
 There was I thinking that if toroids leak field, it would be logical for toriods to leak filed. Possibly known as the " typo" effect? 
__________________
....__________ ....|____||__|__\_____ .=.| _---\__|__|_---_|. .........O..Chris....O |
||
|
|
