Heathkit V-7AU restoration - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

factory · 1st Sep 2018, 10:57 pm

This site has plenty of Heathkit manuals including some of the V-7A manual.

http://tubularelectronics.com/?page_id=64

http://tubularelectronics.com/Heath_...uals_T-X/V-7A/

Hope this helps.

David

wd40addict · 1st Sep 2018, 11:52 pm

Colin, the grey panel and the Pullin meter date your unit to late fifties/early sixties. The modern cable colours would tie in with earth being added in 1975.

The UK Heathkits' panel colour sequence was as follows: grey with white lettering - fifties/early sixties. Grey and silver two tone - mid sixties. Beige with skirted knobs - late sixties/early seventies, biege with unskirted knobs later seventies.

joebog1 · 1st Sep 2018, 11:57 pm

Heathkit manuals here

https://www.vintage-radio.info/heathkit/
https://www.mods.dk/manual.php?brand=heathkit

j.b.

m0xte_chris · 7th Sep 2018, 11:32 pm

Back again.

Restoration of this unit is complete. The probe kit was assembled this evening, the new battery inserted and the unit calibrated against some standard 0.1% resistors, my DMM, power supply and AWG.

So the total changes made were:

1. Replacement of the wax capacitor with a Kemet high voltage film cap. This had dissolved into muck.
2. Replacement of the selenium rectifier with a generic 1N4007 and 3.3K 1/4W resistor.
3. Replacement of the filter capacitor with a Vishay 22uF 160V axial electrolytic capacitor.
4. New probes from a kit by KK4HXJ (these are really good kits!)
5. Replacement of the mains lead with a 3-core grey one (Farnell) and new mains plug and 3A fuse.
6. Grounding of the unit with a solder lug on the battery holder.
7. Re-calibration of the unit.

Click image for larger version

Name: 34EB8901-182B-43F4-B31A-1BA7B315B4D0.jpg
Views: 136
Size: 50.6 KB
ID: 168939

That was fun. Onto the RF-1U next. Getting into this valve stuff now

1st Sep 2018, 10:57 pm	#21
factory Octode Join Date: Jul 2009 Location: Cheshire, UK. Posts: 1,738	Re: Heathkit V-7AU restoration This site has plenty of Heathkit manuals including some of the V-7A manual. http://tubularelectronics.com/?page_id=64 http://tubularelectronics.com/Heath_...uals_T-X/V-7A/ Hope this helps. David Last edited by factory; 1st Sep 2018 at 11:06 pm. Reason: correction

1st Sep 2018, 11:52 pm	#22
wd40addict Octode Join Date: May 2009 Location: Stevenage, Herts. UK. Posts: 1,518	Re: Heathkit V-7AU restoration Colin, the grey panel and the Pullin meter date your unit to late fifties/early sixties. The modern cable colours would tie in with earth being added in 1975. The UK Heathkits' panel colour sequence was as follows: grey with white lettering - fifties/early sixties. Grey and silver two tone - mid sixties. Beige with skirted knobs - late sixties/early seventies, biege with unskirted knobs later seventies.

1st Sep 2018, 11:57 pm	#23
joebog1 Banned Join Date: Jun 2015 Location: Mareeba, North Queensland, Australia Posts: 2,704	Re: Heathkit V-7AU restoration Heathkit manuals here https://www.vintage-radio.info/heathkit/ https://www.mods.dk/manual.php?brand=heathkit j.b.

7th Sep 2018, 11:32 pm	#24
m0xte_chris Retired Dormant Member Join Date: Aug 2018 Location: London, UK. Posts: 15	Re: Heathkit V-7AU restoration Back again. Restoration of this unit is complete. The probe kit was assembled this evening, the new battery inserted and the unit calibrated against some standard 0.1% resistors, my DMM, power supply and AWG. So the total changes made were: 1. Replacement of the wax capacitor with a Kemet high voltage film cap. This had dissolved into muck. 2. Replacement of the selenium rectifier with a generic 1N4007 and 3.3K 1/4W resistor. 3. Replacement of the filter capacitor with a Vishay 22uF 160V axial electrolytic capacitor. 4. New probes from a kit by KK4HXJ (these are really good kits!) 5. Replacement of the mains lead with a 3-core grey one (Farnell) and new mains plug and 3A fuse. 6. Grounding of the unit with a solder lug on the battery holder. 7. Re-calibration of the unit. That was fun. Onto the RF-1U next. Getting into this valve stuff now