Forums :: Resources :: Features :: Photo Gallery :: Vintage Radio Shows :: Archives
Support This Site: Contributors :: Advertise


It is currently Dec Thu 12, 2019 5:08 pm


All times are UTC [ DST ]





Post New Topic Post Reply  [ 3 posts ] 
Author Message
 Post subject: Hickok model 288X help
PostPosted: Nov Mon 18, 2019 2:27 am 
New Member

Joined: Apr Tue 12, 2016 3:51 am
Posts: 1
I am in the process of restoring a Hickok 288X signal generator. The problem I am having is in the A-F oscillator section. All of the schematics that I have found so far show a 6SJ7 as the oscillator tube, the unit I have uses a 6SK7 and a few added components that are not shown on the literature that I have. Most of the circuit looks factory and some looks as if it was repaired or altered at some time. Does anyone have any experience with this? I know that Hickok was known to make revisions during production without documentation, perhaps this circuit was used in the model 288AX. Any help would be greatly appreciated. Regards, Ed


Top
 Profile  
 
 Post subject: Re: Hickok model 288X help
PostPosted: Nov Mon 18, 2019 12:12 pm 
Member

Joined: Nov Wed 30, 2016 7:35 pm
Posts: 5399
Location: Sunbury, Ohio 43074
[quote]I know that Hickok was known to make revisions during production without documentation/quote]

The bane of the would-be antique equipment restorer. ;-). Sometimes you have to just draw out the "mods" yourself and hope you can reverse engineer what Hickok had in mind....

_________________
Preserving the hist. of electronics, one boat anchor at a time! :)
https://www.bbtvtestequipment.com


Top
 Profile  
 
 Post subject: Re: Hickok model 288X help
PostPosted: Nov Mon 18, 2019 6:35 pm 
Member

Joined: Jun Thu 12, 2014 4:03 am
Posts: 58
Ed,

I don't know whether you stumbled on this one or not, but I found the military version of the Hickok generator very helpful for theory of operation and troubleshooting information. It does not document the use of the SK7, but I can confirm that the three 288AX units I have all have the SK7 tube in them. The manual is mildly confusing because it covers 3 versions of the instrument, and freely jumps around among them.

Regards,

Jim


Attachments:
hickok 288 military ts465-u.pdf [15.92 MiB]
Downloaded 7 times
Top
 Profile  
 
Post New Topic Post Reply  [ 3 posts ] 

All times are UTC [ DST ]


Who is online

Users browsing this forum: bart, Jim Beckford and 10 guests



Search for:
Jump to:  




























Privacy Policy :: Powered by phpBB