DCAudioDIY.com

DC Area Audio DIYer's Community
It is currently September 24th, 2020, 1:52 am

All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 14 posts ]  Go to page 1, 2  Next
Author Message
PostPosted: September 15th, 2020, 9:51 pm 
Offline

Joined: September 6th, 2020, 11:18 am
Posts: 4
Hi All - I’m on the hunt for a Peerless OPT 16458 to go into a Heathkit W5M Mono. Thanks in advance.


Top
 Profile  
 
PostPosted: September 16th, 2020, 8:30 am 
Offline
User avatar

Joined: July 24th, 2015, 4:17 pm
Posts: 1249
Location: Parkville, Maryland
This offering might take care of your problem:

https://www.ebay.com/itm/Heathkit-W-5-A ... Swv-lekl1W

_________________
Walt


Top
 Profile  
 
PostPosted: September 16th, 2020, 9:24 am 
Offline

Joined: September 6th, 2020, 11:18 am
Posts: 4
Thanks Walt - I saw that but it's a 16309.


Top
 Profile  
 
PostPosted: September 16th, 2020, 11:09 am 
Offline
User avatar

Joined: July 24th, 2015, 4:17 pm
Posts: 1249
Location: Parkville, Maryland
desron65 wrote:
Thanks Walt - I saw that but it's a 16309.


I get that. I believe it was designed for a WM-5a. If the difference between WM-5a and WM-5 has nothing to do with the transformer, then you nailed it.

Maybe a little homework to find out the differences. At least it is a Peerless suited to service with KT-88s.

_________________
Walt


Top
 Profile  
 
PostPosted: September 16th, 2020, 11:29 am 
Offline
User avatar

Joined: July 24th, 2015, 4:17 pm
Posts: 1249
Location: Parkville, Maryland
desron65 wrote:
Thanks Walt - I saw that but it's a 16309.


I just did a little "homework." (I've been cooped up too long) I will just quote the guy and Vacuum Tube Valley magazine because they appear to have been diligent with regards to their findings:

" The Heathkit W-5M was supplied with two diferent Peerless output transformers during its production run. Although both transformers are excellent there might be some slight audible differences between them and your stereo pair can not be considered as well matched. Also, the smaller (16309) transformer is know to be failure prone and many of them have open (half) primary windings.

Here's a quote from VTV Issue 2 Vol.1 regarding the W-5M:

"... Through 1957, W-5M's featured the larger Peerless 16458 output transformer. From 1957 through 1963, the newer design and smalller 16309 Peerless transformer was employed. Though more common, the 16309 is no slouch. It has exceptional characteristics and performance. Some Heath experts claim that the 16309 Peerless has more extended highs..."

"As the transformers are electrically and physically different you may expect some differences, but this is greatly compensated by the 18.1 dB global NFB applied around the entire amplifier, including the OPT."

"Still, I don't like the idea of a (stereo) pair of amps with different OPT's..."


Or to shorten the story -- keep looking for the exact replacement. Apparently Heathkit needed to upgrade the OPT because of problems with the original.

Nothing comes easy in this hobby. :angry-banghead:

_________________
Walt


Top
 Profile  
 
PostPosted: September 16th, 2020, 11:55 am 
Offline
Site Admin
User avatar

Joined: February 28th, 2013, 10:38 am
Posts: 1370
SoundMods wrote:
Apparently Heathkit needed to upgrade the OPT because of problems with the original.


Re-read what you quoted, looks like the later (probably cheaper) version is the one with problems...

Roscoe

_________________
I can explain it to you, but I can’t understand it for you.


Top
 Profile  
 
PostPosted: September 16th, 2020, 1:33 pm 
Offline
User avatar

Joined: July 24th, 2015, 4:17 pm
Posts: 1249
Location: Parkville, Maryland
Roscoe Primrose wrote:
SoundMods wrote:
Apparently Heathkit needed to upgrade the OPT because of problems with the original.


Re-read what you quoted, looks like the later (probably cheaper) version is the one with problems...

Roscoe


10-4

_________________
Walt


Top
 Profile  
 
PostPosted: September 16th, 2020, 2:33 pm 
Offline

Joined: September 6th, 2020, 11:18 am
Posts: 4
So the 16458 is prone for problems or the 309? I thought that the 309 was the one with issues but sounded better? Thanks


Top
 Profile  
 
PostPosted: September 16th, 2020, 2:55 pm 
Offline
User avatar

Joined: July 24th, 2015, 4:17 pm
Posts: 1249
Location: Parkville, Maryland
desron65 wrote:
So the 16458 is prone for problems or the 309? I thought that the 309 was the one with issues but sounded better? Thanks


The 16458 came first with the following "upgrade", the 309, being prone to problems. I had it bass ackwards. The good one (16458) was used through 1957 then after 1957 the smaller transformer was used -- the one with problems.

Like I said -- I've been cooped up too long. :text-givemebeer:

_________________
Walt


Top
 Profile  
 
PostPosted: September 16th, 2020, 4:01 pm 
Offline

Joined: September 6th, 2020, 11:18 am
Posts: 4
Thanks for the info. I appreciate the help. I am sure that a 16458 will show up eventually. Thanks again.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 14 posts ]  Go to page 1, 2  Next

All times are UTC - 5 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 0 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Group