Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: duke of earl on March 18, 2012, 07:54:45 pm

Title: Transformer label ID help needed
Post by: duke of earl on March 18, 2012, 07:54:45 pm

I have a power tranny TF-130 1052 9716 and an output tranny TF-135 1052 9444 that I am having a fit finding identification for on the web. I know they are for a 4-6L6 amp but do not know what the extra 8 digits mean.

Title: Re: Transformer label ID help needed
Post by: HotBluePlates on March 18, 2012, 08:13:51 pm

According to a couple sources of unknown reliability, they are transformers sold by MagicParts. The TF# is simply a relabel done by MagicParts to conform to their numbering scheme. But then, Vibroworld has Pacific Transformers listed with the same numbering scheme.

Amp Garage thread (http://ampgarage.com/forum/viewtopic.php?t=14196&sid=ec946098ffdb808189d7b4917d2e3fc6)

"Rumble notes" (http://www.prowessamplifiers.com/schematics/rumble/rumblenotes.pdf)

Vibroworld Pacific Transformers (http://www.vibroworld.com/parts/tech5.html)

Title: Re: Transformer label ID help needed
Post by: duke of earl on March 18, 2012, 08:20:15 pm

Thanks HotBluePlates. I was on their website earlier and found them but am not sure about the additional digits and their meaning.

Title: Re: Transformer label ID help needed
Post by: HotBluePlates on March 18, 2012, 08:32:00 pm

Well, one of the sites of earlier info claimed the MagicParts transformers were simply re-labeled Pacific transformers.

The EIA Code List at Triode Electronics (http://www.triodeel.com/eiacode.htm) seems to confirm that. "1052" is the EIA code for Pacific.

The other digits are YYWW format, indicating the year and week of manufacture. Looks like your TF-130 was made the 16th week of 1997, and your TF-135 made the 44th week of 1994.

The transformers are (as far as I know) the power and output transformers for a Twin or comparable 4x 6L6 amp.

Title: Re: Transformer label ID help needed
Post by: duke of earl on March 19, 2012, 08:53:37 pm

Wow thanks for researching that BluePlates. I wonder if the iron is descent quality?

Title: Re: Transformer label ID help needed
Post by: dude on March 19, 2012, 09:30:49 pm

It also says in the Magic Parts catalog number 55, relatively recent:

*Note: TF125/135 may require re-drilling 2 mounting holes.

They're probably talking about a Twin OT replacement

Specifications for the TF135 from the catalog:

Primary (Plate to Plate): 1,900 OHMS
Secondary: 4 OHMS - no taps
Freq Response < 1 dB roll off: 20HZ to 20K HZ

sells for (one) $88.15 

al

Title: Re: Transformer label ID help needed
Post by: FYL on March 20, 2012, 03:50:51 am

Quote

I wonder if the iron is descent quality?

No direct experience with the mentioned iron but the few Pacific-sourced PTs and OTs I've tested or used were excellent.

Title: Re: Transformer label ID help needed
Post by: duke of earl on March 21, 2012, 06:32:42 pm

Great! Thanks for all the replies.