Hacker RP17 and RP17A. - UK Vintage Radio Repair and Restoration Discussion Forum

classic · 24th Feb 2009, 7:13 am

Hello.
Does anyone knows who is the difference between Hacker PR17 and Hacker PR17A

Thank you
Regards

petervk2mlg · 24th Feb 2009, 7:35 am

I'm sure others can answer this question more fully, but I reckon the RP17 used the smaller PP7 batteries, wheras the RP17A took the larger PP9 batteries.
The cabinet of the 17 is slightly smaller than the 17A.
Peter

Paul_RK · 24th Feb 2009, 8:26 am

Yes, those are the changes any user will notice, along with changed operation of the on/off switch - the RP17, unlike the 17A, is turned on by depressing either waveband button. Also the amplifier board was radically redesigned for the RP17A in both circuitry and layout.

Paul

classic · 25th Feb 2009, 4:19 pm

Thank you.

I can find schematic for PR17A but not for PR17.
So i need to know if schematics are the same

?
Regards

Paul_RK · 25th Feb 2009, 4:54 pm

Tuner/IF circuitry and board layout are at least very similar, but the RP17's amplifier board and its schematic don't much resemble the 17A's - or that of any other Hacker model, as far as I know. With any luck someone here may have the manual.

Paul

classic · 1st Mar 2009, 6:06 am

Thanks Paul

wireful3 · 1st Mar 2009, 11:05 am

There is a difference in the supply circuit between the RP17 & RP17A.

In the RP17 the lower voltage for the RF/IF unit is taken from the junction between the two PP7 batteries and the ON/OFF switch is double pole to allow this. From memory I think it also means the plug for the AF amplifier also uses more connections.

The RP17A uses a simpler system with the two PP9 batteries permanently connected together and a single pole switch. The lower voltage for the RF/IF unit is obtained with a dropping resistor from the 18 volt supply. It caused trouble on one of my sets because this voltage was too low. I never solved the problem and as I found a set that was working I gave up trying. It was one of the situations where all the components separately were fine but connected together it did not work.

There is also a difference in the volume control. In the RP17 it is connected directly to the common chassis but in the 17A it seems to connect to the chassis by a large capacitor.

24th Feb 2009, 7:13 am	#1
classic Retired Dormant Member Join Date: Feb 2009 Location: Karditsa, Greece Posts: 6	Hacker RP17 and RP17A. Hello. Does anyone knows who is the difference between Hacker PR17 and Hacker PR17A Thank you Regards

24th Feb 2009, 7:35 am	#2
petervk2mlg Heptode Join Date: Jan 2007 Location: Parkes, NSW Australia Posts: 877	Re: Hacker PR17 I'm sure others can answer this question more fully, but I reckon the RP17 used the smaller PP7 batteries, wheras the RP17A took the larger PP9 batteries. The cabinet of the 17 is slightly smaller than the 17A. Peter

24th Feb 2009, 8:26 am	#3
Paul_RK Dekatron Join Date: Nov 2003 Location: Fakenham, Norfolk, UK. Posts: 4,256	Re: Hacker PR17 Yes, those are the changes any user will notice, along with changed operation of the on/off switch - the RP17, unlike the 17A, is turned on by depressing either waveband button. Also the amplifier board was radically redesigned for the RP17A in both circuitry and layout. Paul

25th Feb 2009, 4:19 pm	#4
classic Retired Dormant Member Join Date: Feb 2009 Location: Karditsa, Greece Posts: 6	Re: Hacker RP17 and RP17A. Thank you. I can find schematic for PR17A but not for PR17. So i need to know if schematics are the same? Regards

25th Feb 2009, 4:54 pm	#5
Paul_RK Dekatron Join Date: Nov 2003 Location: Fakenham, Norfolk, UK. Posts: 4,256	Re: Hacker RP17 and RP17A. Tuner/IF circuitry and board layout are at least very similar, but the RP17's amplifier board and its schematic don't much resemble the 17A's - or that of any other Hacker model, as far as I know. With any luck someone here may have the manual. Paul

1st Mar 2009, 6:06 am	#6
classic Retired Dormant Member Join Date: Feb 2009 Location: Karditsa, Greece Posts: 6	Re: Hacker RP17 and RP17A. Thanks Paul

1st Mar 2009, 11:05 am	#7
wireful3 Retired Dormant Member Join Date: Sep 2003 Location: Bristol, UK. Posts: 808	Re: Hacker RP17 and RP17A. There is a difference in the supply circuit between the RP17 & RP17A. In the RP17 the lower voltage for the RF/IF unit is taken from the junction between the two PP7 batteries and the ON/OFF switch is double pole to allow this. From memory I think it also means the plug for the AF amplifier also uses more connections. The RP17A uses a simpler system with the two PP9 batteries permanently connected together and a single pole switch. The lower voltage for the RF/IF unit is obtained with a dropping resistor from the 18 volt supply. It caused trouble on one of my sets because this voltage was too low. I never solved the problem and as I found a set that was working I gave up trying. It was one of the situations where all the components separately were fine but connected together it did not work. There is also a difference in the volume control. In the RP17 it is connected directly to the common chassis but in the 17A it seems to connect to the chassis by a large capacitor.