Just moved my setup from my shop to the basement. Not for frame building but for plumbing! In the process of a new boiler installation and 1.25" copper takes more than 1 mapping torch. Found this out last time.
Now to determine which tip? Thinking the Rosebud!

Tom, you might consider a G-tec #3 multipart tip. It is similar to a rosebud except the center hole/flame is a little more dominate. That sharp center flame sticks out a little further than the surrounding flames. I love that tip for doing fork crowns to steerer brazing. The center flame allows me to better clean shorelines We used this tip when we were brazing forks during out fork making party last week. You have to order directly from G-tec. They used to make the TEN series of propane tips with Victor threads in brass. G=tec also makes mixers for the commonly available airline torch handles like the Smith AW1A. These mixers make it possible to use any Victor tip with almost any brand of torch handle. They have available elbows of different lengths with victor threads (with that odd 27 teeth per inch) that go into the mixer and on the other end have Victor threads for any Victor tip.

Doug. Is it me or is their website a bit challenging to navigate?

Yea their website will not win any awards. https://www.gas-tec.com/torchtips I had to call them to get some information.

Just did a number of copper sweat joints with my oxy/propane setup. Wow much quicker than MAPP gas!

for brazing the whole bike frame with oxy/propane, which G-TEC tips do you recommend to have? 1-3? also, is the mixer any different from a UN-J and worth getting or if I have a J28 then a UN-J would be the same?

I'm going to start a separate subject thread on tip suggestions after the recent loss of TM Technologies and Paige Tools. Meco and Paige tips were 1/4" X 28 tpi threading - which is going to become obsolete for use on airline torch handles. What is still commonly available is Victor's 5/16" X 27 tpi threading - which of course is an oddity in the real world. It is like the old Schwinn tire sizes after WWII. There is no need to get the G-tec Mixer and elbow (2 separate pieces). The UN-J is perfect for Victor type torch handles. If someone has a Smith AW1A torch handle then the G-tec mixer/elbow can use Victor tips on that torch handle. They have a mixer designed specificallyf for Smith handles. The threads on the end of that mixer and both ends of the elbow all have Victor threads.

G-tec multi-port tips have a high BTU rating - more than what many beginners find comfortable to use. The G-tec #3 multiport is really good for places that require a higher volume of heat like a crown to a steerer. Its sharp center flame is great for cleaning shorelines of extra silver or brass. I could very comfortably use it brazing lugs. In fact it is probably superior brazing lugs because I can do it quickly with that tip with less distortion. Those on the early side of the learning curve typically need a smaller flame so they can better asses and adjust to what is happening at the joint.

As a reminder, multi-tips work better than single flame tips because they don't blow out as easily with gas pressure bounce back. However the Victor TEN tips with a propane friendly recess work just fine. The number TEN-1 through TEN-3 would centrally be in my tip inventory. I've gotten so I change tips to better match what I am brazing.

Thank you for the reply. A thread about propane tips would be indeed very helpful given the change is in available tips. Thank you for all the great advise on oxy/propane brazing across forums.

Here is an idea I had, mostly to save on tips which add up pretty fast specially as I live in Canada. (TEN tips or the g-tec tips are at least 50 CAD each). Want to know what do you think.
From here: https://kuromori.home.blog/propane-a...e-accessories/
I gather that H01-2 multiport tips from AliExpress are good and very very cheap but they have a M6x1 tread. In the link above the person talk about adapting some cheap tips/mixers to fit them but that seems complicated. Looking around I found this https://www.fittings.space/gbm21-01zf-m6x10m , a 1/16 NTP (which If I am correct is 5/16x27 TPI) female to M6x1 adaptor for 10 bucks. So my plan would be to get the UN-J mixer (which I can get for about 100 CAD) but then buy this adaptor and use the other tips.
also, same Aliexpress brand sells some acetylene tips that I though could be bored to have some single cone tips.

I am I crazy? would it work? too risky? Thanks