Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Philco 91 Speaker Replacement
#41

Rod

Yep, and 6 ohm still make it 4&6 Icon_lol

It is all pretty approximate.
Not only that, but if one wants to be real anal about these things, the transformer itself behaves in a pretty interesting fashions depending on the frequency range.


At low frequencies the impedance is pretty much that of the reflected resistive impedance of the speaker and the losses of the output winding, paralleled by the equivallent core losses and the primary inductance impedance, and then added to (serialized with) the losses (DCR) of the primary.


At midrange, the impedance is pretty much the same without the primary inductance factor.

And in highs, it is parallel of parasitic capacitance of the windings and the core losses, serialized with full stray inductance (prim and sec), and reflected resistive losses and the resistive load.

Icon_lol

People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.


Messages In This Thread
Philco 91 Speaker Replacement - by dconant - 10-28-2024, 06:54 PM
RE: Philco 91 Speaker Replacement - by morzh - 10-28-2024, 07:22 PM
RE: Philco 91 Speaker Replacement - by dconant - 10-29-2024, 02:52 PM
RE: Philco 91 Speaker Replacement - by morzh - 10-29-2024, 04:28 PM
RE: Philco 91 Speaker Replacement - by Arran - 10-30-2024, 02:18 AM
RE: Philco 91 Speaker Replacement - by morzh - 10-30-2024, 09:07 AM
RE: Philco 91 Speaker Replacement - by dconant - 10-30-2024, 09:27 AM
RE: Philco 91 Speaker Replacement - by morzh - 10-30-2024, 09:41 AM
RE: Philco 91 Speaker Replacement - by dconant - 10-30-2024, 11:14 AM
RE: Philco 91 Speaker Replacement - by dconant - 10-31-2024, 08:45 AM
RE: Philco 91 Speaker Replacement - by RodB - 10-31-2024, 09:02 AM
RE: Philco 91 Speaker Replacement - by morzh - 10-31-2024, 09:15 AM
RE: Philco 91 Speaker Replacement - by dconant - 10-31-2024, 09:34 AM
RE: Philco 91 Speaker Replacement - by morzh - 10-31-2024, 09:44 AM
RE: Philco 91 Speaker Replacement - by dconant - 11-01-2024, 11:54 AM
RE: Philco 91 Speaker Replacement - by morzh - 11-01-2024, 12:02 PM
RE: Philco 91 Speaker Replacement - by dconant - 11-01-2024, 12:14 PM
RE: Philco 91 Speaker Replacement - by morzh - 11-01-2024, 12:16 PM
RE: Philco 91 Speaker Replacement - by Arran - 11-01-2024, 04:07 PM
RE: Philco 91 Speaker Replacement - by dconant - 11-01-2024, 04:26 PM
RE: Philco 91 Speaker Replacement - by RodB - 11-01-2024, 05:48 PM
RE: Philco 91 Speaker Replacement - by Arran - 11-01-2024, 08:11 PM
RE: Philco 91 Speaker Replacement - by RodB - 11-02-2024, 09:53 AM
RE: Philco 91 Speaker Replacement - by dconant - 11-02-2024, 10:03 AM
RE: Philco 91 Speaker Replacement - by RodB - 11-02-2024, 11:16 AM
RE: Philco 91 Speaker Replacement - by dconant - 11-02-2024, 11:23 AM
RE: Philco 91 Speaker Replacement - by RodB - 11-02-2024, 11:29 AM
RE: Philco 91 Speaker Replacement - by RodB - 11-02-2024, 11:36 AM
RE: Philco 91 Speaker Replacement - by dconant - 11-02-2024, 11:56 AM
RE: Philco 91 Speaker Replacement - by dconant - 11-03-2024, 01:04 PM
RE: Philco 91 Speaker Replacement - by RodB - 11-03-2024, 03:42 PM
RE: Philco 91 Speaker Replacement - by MrFixr55 - 11-03-2024, 10:43 PM
RE: Philco 91 Speaker Replacement - by dconant - 11-04-2024, 08:15 AM
RE: Philco 91 Speaker Replacement - by morzh - 11-04-2024, 10:48 AM
RE: Philco 91 Speaker Replacement - by dconant - 11-07-2024, 07:10 PM
RE: Philco 91 Speaker Replacement - by morzh - 11-07-2024, 09:23 PM
RE: Philco 91 Speaker Replacement - by dconant - 11-08-2024, 08:59 AM
RE: Philco 91 Speaker Replacement - by morzh - 11-08-2024, 10:50 AM
RE: Philco 91 Speaker Replacement - by RodB - 11-08-2024, 10:52 AM
RE: Philco 91 Speaker Replacement - by morzh - 11-08-2024, 11:15 AM
RE: Philco 91 Speaker Replacement - by dconant - 11-08-2024, 01:14 PM
RE: Philco 91 Speaker Replacement - by morzh - 11-08-2024, 01:48 PM
RE: Philco 91 Speaker Replacement - by morzh - 11-08-2024, 01:54 PM
RE: Philco 91 Speaker Replacement - by dconant - 11-08-2024, 02:32 PM
RE: Philco 91 Speaker Replacement - by morzh - 11-08-2024, 03:32 PM
RE: Philco 91 Speaker Replacement - by dconant - 11-08-2024, 04:49 PM
RE: Philco 91 Speaker Replacement - by morzh - 11-08-2024, 08:53 PM



Users browsing this thread: 5 Guest(s)
[-]
Recent Posts
Philco 46-420 Code 121 Reception issues
You mentioned the Philco manual and going through the check points...just to be sure we're on the same page here's the m...klondike98 — 08:13 PM
Philco 42-1008 conversion kit
Interesting. I haven't seen that before.klondike98 — 07:02 PM
12' Philco
Yes I had looked for it on the web as well some time back and could not find it. I was glad to see it turned up in Ron'...klondike98 — 06:59 PM
Shadow Meter Bulb
Now if you had a set with a tuning light then the bulb type is important to the circuit, some sets used those prior to t...Arran — 04:58 PM
Shadow Meter Bulb
Ok. Thanks for the correction.RossH — 03:09 PM
Model 28L
For 28 you will probably need to buy a Hammond 125CSE. Or any of the series of the power you need, with SE suffix. Then ...morzh — 02:09 PM
37-60 revision 6
I am restoring a Philco 37-60 and it shows run 6 they removed the ground from G3 of the 6K7G and put the G3 to -2.5v for...bobbyd1200 — 01:01 PM
Shadow Meter Bulb
Mike is correct on the bulb connection, two separate circuits. I found that by rotating the bulb and sliding it forward ...RodB — 12:19 PM
Hickok AC51 tube tester
Cleaned ann contacts, switches and sockets, works great now.martinj — 11:32 AM
Model 28L
Hello, I'm restoring a Philco 28L and the output transformer is open. Part number of the transformer is 32-7020. Can...HORSTE — 10:32 AM

[-]
Who's Online
There are currently 2892 online users. [Complete List]
» 2 Member(s) | 2890 Guest(s)
AvatarAvatar

>