Hello Goldfinger:
I would like to get more HiFi sounds out of this radio in TX and RX mode
Your help will be appreciated
Thank you in advance
A365/Tony
Teaberry T 40 Ch Hybrid
- Goldfinger
- Site Maintenance
- Posts: 3860
- Joined: Sat Jun 30, 2007 12:27 am
- Location: Beaver State
- Goldfinger
- Site Maintenance
- Posts: 3860
- Joined: Sat Jun 30, 2007 12:27 am
- Location: Beaver State
RX:
C408 - Change to a .22uF, 50 volt or higher
More highs?
C410 - Change to a 330 or 220pF, 50 volt or higher
This unit has a strange always on ANL circuit. Because of this I'm not sure if C407 also needs to be made larger without having an actual radio to play with. This cap also feeds the AGC line. If the receive seems to be lacking lows after the conversion, change C407 to a .1-.22uF, 50 volt or higher. Let me know a365 after you modify the radio and I'll edit this post accordingly. Thanks!
TX/RX:
C511 - Change to a .22uF, 250 volt or higher
If the squelch acts sluggish, lower to a .1uF
C513 - Change ta a 22uF, 25 volt or higher Electrolytic, observe polarity
C601 - Change to a .22uF, 250 volt or higher
TX:
C504 - Change to a .22uF, 250 volt or higher
More highs?
C502 - Change to a 330 or 220pF, 50 volt or higher
C905 - Change to a 4.7uF, 350 volt or higher Electrolytic, observe polarity
Disable AMC - Remove C604
Variable power - Add a 50K, 2W potentiometer in series with R904
More peak power?
C912 - Change to a 1uF, 350 volt or higher Electrolytic with the negative lead towards L907
Click here for full size
Click here for full size
C408 - Change to a .22uF, 50 volt or higher
More highs?
C410 - Change to a 330 or 220pF, 50 volt or higher
This unit has a strange always on ANL circuit. Because of this I'm not sure if C407 also needs to be made larger without having an actual radio to play with. This cap also feeds the AGC line. If the receive seems to be lacking lows after the conversion, change C407 to a .1-.22uF, 50 volt or higher. Let me know a365 after you modify the radio and I'll edit this post accordingly. Thanks!
TX/RX:
C511 - Change to a .22uF, 250 volt or higher
If the squelch acts sluggish, lower to a .1uF
C513 - Change ta a 22uF, 25 volt or higher Electrolytic, observe polarity
C601 - Change to a .22uF, 250 volt or higher
TX:
C504 - Change to a .22uF, 250 volt or higher
More highs?
C502 - Change to a 330 or 220pF, 50 volt or higher
C905 - Change to a 4.7uF, 350 volt or higher Electrolytic, observe polarity
Disable AMC - Remove C604
Variable power - Add a 50K, 2W potentiometer in series with R904
More peak power?
C912 - Change to a 1uF, 350 volt or higher Electrolytic with the negative lead towards L907
Click here for full size
Click here for full size
wwpdx
wwpdx.com
wwpdx.com
Hello Goldfinger:
WOW,You Da Man Goldfinger
You can to my rescue again plus you posted the mod for the 23 Ch version too which I happen to have in my small junker collection waiting to be restored
I do not have all the capacitors to do the mods right now,please bare with me while I place an order from Mouse-R and Evilbay
I guesstimate that will take me about a month to get back to you and post my results
BTW,I payed $66.00 on Evilbay including free shipping with a D-104 MB6 back in December
Once in a while if the radio gets to hot the receiver drops down,I read on the internet that could be related to a resistor,tube socket or a tube failing
Anyway,I got a Gemtronics GTX-5000,Gemtronics GTX-2300,Colt Midnite Special and the Teaberry Model T 40,same Panasonic chassis just for the record
Thanks again Goldfinger
WOW,You Da Man Goldfinger
You can to my rescue again plus you posted the mod for the 23 Ch version too which I happen to have in my small junker collection waiting to be restored
I do not have all the capacitors to do the mods right now,please bare with me while I place an order from Mouse-R and Evilbay
I guesstimate that will take me about a month to get back to you and post my results
BTW,I payed $66.00 on Evilbay including free shipping with a D-104 MB6 back in December
Once in a while if the radio gets to hot the receiver drops down,I read on the internet that could be related to a resistor,tube socket or a tube failing
Anyway,I got a Gemtronics GTX-5000,Gemtronics GTX-2300,Colt Midnite Special and the Teaberry Model T 40,same Panasonic chassis just for the record
Thanks again Goldfinger
Hello Goldfinger:
Just an update
Is been a month since I posted the last message and I still waiting for 1 set of capacitors to star the mods on the Teaberry T40 Hybrid
Sometime next week I will get the last part to complete the mods
(slow boat from China)
Thanks again for all your help and I will get back to you with in the next 2 weeks
Regards
Tony/A365
Just an update
Is been a month since I posted the last message and I still waiting for 1 set of capacitors to star the mods on the Teaberry T40 Hybrid
Sometime next week I will get the last part to complete the mods
(slow boat from China)
Thanks again for all your help and I will get back to you with in the next 2 weeks
Regards
Tony/A365
Re: AMC tube radios
Hello
First i hope this does not double post as i was almost done with my first try and all of a sudden
the post i was working on vanished?
I hope this i read by Goldfinger as i belive he is the one that came up with the mods.
I have searched for over a year looking for mods to the 40 and 23 channel tube radios and all the sister
versions. I Have both of the Robyn,Gemtronic and Teaberry twins 40&23 channnel versions as well as most
of the other 23 channel versions. Anyways I was thrilled to do the AMC mod and tested the radio both before
and after cllipping C604 and not a thing changed:(. Talk about being bummed out, So i was wondering
if you could double check the part number and verify that its C604 that needs to be clipped or removed to
remove the limiter? Just to be sure i tried it on two radios and did not change on both. I love these radios
but i really need more audio out of these and i am more than willing to try whatever you can come up with.
Thank you for reading.
Jtrouter
Disable AMC - Remove C604
First i hope this does not double post as i was almost done with my first try and all of a sudden
the post i was working on vanished?
I hope this i read by Goldfinger as i belive he is the one that came up with the mods.
I have searched for over a year looking for mods to the 40 and 23 channel tube radios and all the sister
versions. I Have both of the Robyn,Gemtronic and Teaberry twins 40&23 channnel versions as well as most
of the other 23 channel versions. Anyways I was thrilled to do the AMC mod and tested the radio both before
and after cllipping C604 and not a thing changed:(. Talk about being bummed out, So i was wondering
if you could double check the part number and verify that its C604 that needs to be clipped or removed to
remove the limiter? Just to be sure i tried it on two radios and did not change on both. I love these radios
but i really need more audio out of these and i am more than willing to try whatever you can come up with.
Thank you for reading.
Jtrouter
Disable AMC - Remove C604
- Goldfinger
- Site Maintenance
- Posts: 3860
- Joined: Sat Jun 30, 2007 12:27 am
- Location: Beaver State
Re: Teaberry T 40 Ch Hybrid
Yes, C604 is correct. It may not make any difference if you already have VR4 all the way up. Also, make sure D602 wasn't disconnected by a previous owner. Removing it also disables the AMC.
wwpdx
wwpdx.com
wwpdx.com